SERVICING VIDEO SATELLITE DEVELOPMENTS

Transcription

1 ILE 011 SERVICING VIDEO SATELLITE DEVELOPMENTS Insi. the Ferguson IKC2 Chassis sh Perform ce Audi yitems for TV Receivers Electrolytic cap. itor ESR Meter ay's Problems in t orkshop 04 au In In g Clim A REED BUSINESS PUBLICATION

2 NTE WILLOW VALE ELECTRONICS LTD 1/1/ ' E GOT H E SPARES '1111 CAL L N 0 W READING MANCHESTER NOTTINGHAM

3 APRIL 1993 Vol. 43, No.6 Issue 510 On sale March 17th COPYRIGHT Reed Business Publishing Ltd., 1993 Copyright in all drawings, photographs and articles published in Television is fully protected and reproduction or imitation in whole or in part is expressly forbidden. All reasonable precautions are taken by Television to ensure that the advice and data given to readers are reliable. We cannot however guarantee it and we cannot accept legal responsibility for it. CORRESPONDENCE All correspondence regarding advertisements should be addressed to the Advertisement Manager, "Television", Quadrant House, The Quadrant, Sutton, Surrey SM2 5AS.Editorial correspondence should be addressed to "Television" Editorial Department, Reed Business Publishing, Quadrant House, The Quadrant, Sutton, Surrey SM2 5AS. INDEXES AND BINDERS Indexes to Vols. 39 and 40 are available at 2.00 from the Editorial office (address above) Indexes to Vols. 37 and 38 are available at 1.50 each. Photostats of the indexes to Vols can be supplied at 1.00 each. Make cheques etc. payable to Reed Business Publishing Ltd. Binders that hold twelve issues of Television are available for 5 each from Television Binders, 78 Whalley Road, Wilpshire, Blackburn BB1 9LF. Make cheques payable to "Television Binders". SUBSCRIPTIONS An annual subscription costs 26 in the UK, 30 overseas (by surface mail - airmail quote on request). Send orders with payment to Quadrant Subscription Services Ltd., Oakfield House, Perrymount Road, Haywards Heath, Sussex, RH16 3DH. Subscription hotline for 24 -hour ordering with Credit Card number BACK NUMBERS Some back issues are available at 2.75 each from Television Back Issues, Room L323, Quadrant House, The Quadrant, Sutton, Surrey SM2 5AS. Make cheques/postal orders payable to Reed Business Publishing Ltd. See box on page Leader 402 Importance of Dish Size with Astra Reception Performance tests on different types of dishes to assess the effects on reception. 404 Letters 406 Modern TV Receiver Techniques, Part 4 Arrangements used for reception of the various sound transmissions - conventional mono f.m., stereo and satellite - and audio systems including spacial effects. 412 VCR Clinic Reports from Eugene Trundle, Nick Beer, Chris Avis, Graham Richards, Brian Storm, Alfred Damp, Chris Watton, Ed Rowland, J.R. Cutts, Michael Dranfield and John Edwards. 415 CD Player Casebook Reports from Nick Beer, Mike Leach and Savio Da Costa. 415 Help Wanted Ian Martin Eugene Trundle 416 Inside the Ferguson IKC2 Chassis J. LeJeune An account of some of the interesting circuitry used in this chassis plus some fault-finding hints. 420 A Day at the Thick End Chris Watton Problems at a villiage TV shop some miles from the nearest town. 422 Long-distance Television DX conditions and reception plus satellite TV and overseas news. 426 Test Case Repairing LED Clock Radios, Part 2 This concluding instalment deals with the radio side. 430 Teletopics News, comment and developments. 431 Next Month in Television Roger Bunney Ian Rees 432 Simple ESR Meter for Electrolytics Ray Porter, M.Sc., C.Eng., M.I.E.E. A method of checking the effective series resistance of aluminium electrolytic capacitors. 434 Camcorner Reports frorr Brian Storm and David C. Woodnott. 435 TV Fault Finding Reports from Philip Blundell, Richard Newman, Paul Hardy, Chris Watton, John Edwards, Michael Dranfield, Brian Storm, Steve Cannon, Alfred Damp and Geoff Fardon. 442 The Universal Transistor 442 Answer to Test Case 364 OUR NEXT ISSUE DATED MAY WILL BE PUBLISHED ON APRIL 21st. Gene Turnbull TELEVISION APRIL

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VXL30 Etc PHILIPS VR VR2024 VR VR , VR Flir100,74116N23.??.,',F,', ' VR6861 VR Pressure Roller Assembly D D D0761 VR6180 VR VR6290 VR6291 VR6293 VR VR6390 VR6391 VR V06670 V / VR '1.61 ' E2.50 ( E E SANYO , E E TC5500 VTC9300 TCM10. VTCM20 VTC5150. VTC , VTC6000. VTC6500. VTC9100 VPR5800. VICM 11. VTCM21. VTCM31 VTCM50 E2.50 1/ V7f 3000 (2.50 SHARP VC VC VC7700 VC C9100 VC9300 VC9500 VC9700 VC20' VC VC384 VC3F VC388 VC390 VC VC6200. VC7750 VC800 E TELEVISION APRIL 1993

7 , VCR PINCHROLLERS Cont. SHARP Cont SAISHO 9 ', SOLARA '51, V, '1 A102 V071104,C4211 0,74214,. t 03SV8110 SAMSUNG V0 I. 1, , VF , VI51, : x111 SIEMEN. I-5238:1 PM 155 ^'I. 81FM 5,7 FM363 FM19, ; 55'0,1 5525, SONY TOSHIBA ARAI VCR BELT KITS ,515 AIWA ALBA AMSTRA AUTHENTIC DECCA FERGUSON FISHER FUJITSU FUNAI 025 VC.020,, 03, GOLDSTAR.1221 G E GRUNDIG HINARI HITACHI 539 VT52 VT61 762, T63, VT64. VT65, VT85 VT86, VT640 JVC CO ,70 1,60 El/ CO 50 E150 El 50 fl E1 00 CO C E1.50 C C CO EEO H 8050 C , , BRDIOC I0 5, / ' 10R,S C MATSUI, MITSUBISHI 08278, , HS ' , E E E1.30 E CIAO fl 80 E1.30 CR C Cl Et 50 E E1.20 E1 50 SAISHO YR21, 038,85 SALORA SV ,7 55'810 SAMSUNG SANYO , , VH VH91, ' SHARP 2C20C VC VC 383 VC388 VC , V VC90,71 5, 91,, VC ,20 VC 730( VC7, , V1, : C VI571 SC''' V ,58' 00,84.11,8' VC,.0651 VC581 5; VC CE.01 ' V / VC 780 0C ,0' V, ' ,05 I j ( 40 0' 7750 VC8000 SONY E ,570, S30753,76 SOT'ME SLCI 5,.67,! El Cl 00 E1.50 CO 95 E1 60 C Cl Cl 00 E1.50 El 20 CO 60 El 50 El El 00 El f1 00 CO E f TOSHIBA V TRIPLERS 5 NIVER5915 E /10!,.n05 SERIES ,90555' DIODE SPLIT TRANSFORMER ,L/E VIDEO MOTORS AMSTRAD AIWA ANA AUTHENTI BLAUNPUNKT DECCA FISHER FERGUSON 6.'(111, 00_-1' 50 FERGUSON & JVC HRD250, HRD565. HRD CAPSTON MOTOR 8930, 8931 INARI HITACHI ITT MITSUBISHI NEC NATIONAL ORION 30E5 C E E C C ( fl f17 00 CO 00 E34 00 C g!z C f C SO ORION Cont PHILIPS SAISHO AMSUNG SANYO SHARP SONY THOMSON f TOSHIBA E CASSETTE HOUSING GRANADA C24 00 F ERGUSON & JVC ITT NATIONAL NEC PHILIPS TEL EFUNKEN THOMSON TOSHIBA GRUNDIG PANASONIC MODE SWITCHES 2, ON/OFF MAIN SWITCHES C E C C E2 50 ITT MATSUI SAISHO 3 50 PHILIPS SONY SON E 2 00 f 55) I l 9 VIDEO LAMPS VIDEO SENSOR LAMPS G1 10 CI, 50 f-1/ 50 el F0 SO,10 50 CO 50 CO 70 (CASSETTE LAMP 5V 115e9A CODE NO VL08) NATIONAL LINE OUTPUT TRANSFORMER CASSETTE DC MOTORS E CASSETTE TAPE HEADS f090 E G RAN DATA LTD K.P. HOUSE, UNIT 15, POP IN COMMERCIAL CENTRE, SOUTHWAY, WEMBLEY, MIDDLESEX, ENGLAND Tel: Fax: TELEVISION APRIL

8 0E ' SONY FLYBACK TRANSFORMERS Pan Na. Modals Price KV E 2200E E 2010SE KV-2012ME 2016ME 2015N1E 2010ME KV-2704EC ( UB 2215E1 2215FE E KV FE 2705U8 2705E EC KV2064EC 20PS1 2082ME7 2056EC KV-2062E1E6P) E22.75 I K0-1440AEC 1440AS MK2 CPS-14CD3 CPV-14CD KTX-1430UB EC 27301E 2764EC F K51882EC 1882UB CH 18824E AM KV-1882ME3 1882H6 1882AS 16TR1 882ECIPS I770R HTIA / FLYBACK TRANSFORMERS FERGUSON 000-4, Tx9 C D -4-20B D G D HT D D01 7X ,110, X GRUNDIO moo El& C14 00 PHILIPS PS GI P PS PS K PS PS K Ps KT PS KT PS KT PS PS PS NC ITT HITACHI CVC CVC CVC CPT CPT 2174 CPT CPT 2178 OUTPUT TV MODULE HM6251 (REF , 5.50 HM IDLERS & PULLEYS REPLACEMENTS AKAI VS4.5 VS15 FF-REW IDLER VS VS15 T-UP IDLER FISHER P/HP FF-REW PULLEY H RHIP COMP. IDLER ASSY FI FVHP FVHP FVHP FVHP FVHP FVHP FVHP GEAR IDLER ASSY FVHP FVHP VHP FVHP840 FVHP REEL T -UP ASSY FVHP FVHP FVHP FVHP840 P/HP GEAR IDLER ASSY FVHP P/ FVHP IDLER Fl C4.50 FVHP FVHP FVHD REEL DRIVE ROLLER FVHP FVHP GEAR FVHP CLUTCH F FVHP IDLER FVHP TAKE UP IDLER 2 00 FVHP990 LOADING GEAR ,3500 REEL DRIVE PULLEY IDLER REW IDLER GOLDSTAR GHV CLUTCH GEAR El G GH GHVP51. VCP IDLER GHV GH GHVP51 VCP NINARI VXL3 VXL20 REEL IDLER '012 'DLER vxl4 VXL35 IDLER VXL4 VXL35 CLUTCH vxl4 VXLI2 VXL25 LIMITER POST VXL V9L5 VXL6 CLUTCH VXL5 VXL6 GEAR HOLDER V017 VXL8 VXL9 CLUTCH 3.80 HITACHI v VT63.64 CLUTCH ASSY CLUTCH ASSY III / v FF.REW IDLER FLAY IDLER F6-REW PULLEY VE am FF-REW IDLER VT PLAY IDLER E IDLER IDLER FE-REW IDLER VT14 16S V V VT FF-REW ARM ( L30vT EF-REW ARM V VTM VT CLUTCH8ASE V VT UP IDLER HARSH ROW IDLER FS -BRAKE IDLER C6.0010/370 I/ IDLER ASSY Ell 00 VS VS P T -UP IDLER Pu S UNLOADING P Ca 00 VS IDLER VP7100 VS9300 REIN IDLER VS9800 VP77. VSIO REEL IDLER C3.00N IDLER VS REEL TABLE EIR VS VS CLUTCH ML E V59700 FE IDLER BV E3 20 VS9700 REW IDLER AMSTRAD VCR7000 IDLER TVR1 VCR4500 CLUTCH VCR4600 VC5200 VCR9000 EVR1 VCR4500 GEAR HOLDER VCR4600 VCR5200 VCR9000 TVR1 VCR4600 REF CLUTCH C96000 VCR6100 CLUTCH VCR4500 VCR9000 CLUTCH 04.0a VCR4500 VCR4600 MOD KIT JAPE CREASING, VCR4700 MOD KIT TAPE CREASING FOR AMSTRAD VCR FERGUSON T -UP idler PU UP IDLER P REEL IDLER P E ROLLER ASSY PU T -UP IDLER UP CLUTCH PU REEL IDLER PU UP CLUTCH PU DO IDLER ARM FV F , L CLUTCH ASSY PU CLUTCH ASSY PU V T -UP CLUTCH PU SUPPORT CLUTCH P : W LOADING IDLER PU V noo REW IDLER PU IDLER PU49281 El V I?. E,-;, HITACHI TV OUTPUT MODULE HIV ' OUTPUT MODULE HIV JVC HR UP IDLER SML Pu HR T -L14 CLUTCH PU HR7655: , REEL IDLER P HR HR ROLLER ASSY HP ( UP IDLER LRG HR T -UP IDLER 01/ R0111 HR HIRD120.12, 22, HRD1I0 HRD T -UP CLUTCH PU55303 C200. HR0225 HR0111 0RDI10 HRD IDLER ARM PU HR011i IDLER ARM P HRD HRS5000 1/ HR CLUTCH MECH P HRT) CLUTCH MECH PU HRD HRP HR3330 ROW IDLER P HR3660 HR4100 HRD TAKE UP CLUTCH P HAPS HRD TAKE UP CLUTCH P HRD HRP50 MATSUI vx CLUTCH V LIMITER POST LEVER ASSY IDLER REEL CI REEL UNIT CLUTCH X900 ASSY IDLER MITSUBISHI GEAR ASSY' [ H IDLER HSE10 HSE20 HSE30 HSE IDLER HS IDLER HMO HSE10 HSE20 HSE30 HSE70 MITSUBISHI Cont. HS IDLER HS200 TAKE UP IDLER (LARGE' 4.50 HS200 UNLOADING IDLER 4.00 HS200 REWIND IDLER SUPPLY REEL 522A00001 E3.20 H DISK TAKE UP REEL E3.20 H DISK HS320 REEL DISK HS REEL DISK 522P PULLEY HS GEARWHEEL HS HS GEAR WHEEL NEC 1/830 N831 N TAKE UP CLUTCH E2.25 N830 N TAKE UP IDLER N833 REEL IDLER N895 TAKE UP IDLER SMALL N915 N REEL DRIVE PULLEY C5.50 N NATIONAL NV600 NV688 IDLER UNIT C AG N0300 NV IDLER ARM VXL0997 [3.60 NV366 NV300 NV330 NV333 IDLER UNIT VXP0401 C NV366 NMI NV333 PLAY IDLER VXP NV366 NV NV ACTION GEAR VOG0016 E0.60 NV340 NV NV NV N0333 NV688 NV2000 LOADING GEAR 0XP NV3000 NV /300 1/0332 NV333 INTERMEDIATE GEAR VXG NV NV788 N02000 NV / /0330 NV333 NV340 CAM GEAR VXG0158 C1.00 NV366 NV777 NV788 1/0230 NV250 NV260 IDLER ARM VXP / NV460 NV465 NV470 NV NV650 NV730 NV780 NV810 NV830 NV850. NV NVG9 NVG NVG12 NVG NVG NV NVH65 NVH70 NV CAM GEAR VDG0200 C NV830 NV850 NVGIO NVG /0730 NV770 IDLER UNIT IDLER UNIT 08P IDLER UNIT El NV3000 CAM GEAR VDG IDLER UNIT / CLUTCH VXP ( IDLER UNIT 110P PLAY IDLER 0% NV8620 CLUTCH VXP N0600 NV688 IDLER VXP0488 C3.50 N01320 NVG PULLEY UNIT C5.00 I V N0230 NV250 NV280 WORM WHEEL NVI30 N0450 NV460 NV465. NV650 NV730 NV770 NV810 I/0870 NV NV180 NV630 IDLER 0X08523 C3.50 /0780 NV830 /0370 CLUTCH GEAR VXP Oa liv57 NvGil WORM WHEEL El /0018 NVG30 NVG120 N0G LOADING GEAR VDG ' N N0370 LOADING GEAR N0430 N NV630 NV730 NV NV810 10/ NVGIO NVG12 NVG15 NVG30 NVG NVH70 A /0230 N CLUTCH GEAR NV730 NV770 NV810 N /007 NVGIO NV511 NVG12 NVG14 NVGI5 NVGI8 NVG NVH /0230 NV LIMITER ROLLER / N / NV NV NV810 NV ' NV N NVG7 N0510 /W012 ' /018 NVG30 141/0120 NVGI NV970 86I000 ORION 52',19aLE MODELS IDLER MULTIPLE MODELS IDLER vh2a IDLER El 20 VH IDLER vhl vh24 DRIVING GEAR VH2A INTERMEDIATE GEAR VC190 VH IDLERlNTE VH205 VH212 VH250 VH254 VH VH / VH VH SAISHO,-,005 / CLUTCH 850A20600 C6.50 V R LIMITER POST El 30 VR IDLER C3.50 vr v IDLER SANYO IDLER T JTC FF-REW IDLER VTC6500 VTCMIO M M21 M30 M31 M50 VTC IDLER ,."TC9300 FF ROLLER ASSY T C2.20 VTCM10 MI I M20 REEL DRIVE PULLEY T M21 i1cm30 M31 M50 V1/ IDLER ', JC PULLEY T C5 20 JC6500 itcm10 M11 M PULLEY T -I JCRS() ,31/ REEL DRIVE ROLLER vhr0500 VHRD700 PR5800 VTC5300 LOADING ROLLER T VIC5400-9"C.1011,.. FWD LIMITER IDLER 5.00 SHARP IDLER NIDL0005GEZZ 1.50 IDLER NIDL0006GEZZ IDLER ASSY NPL EZZ / VC6FR 0060' /C PLAY IDLER KIT NPLYV0041 NDA1V PLEASE PHONE US FOR TYPE NOT LISTED HERE AS WE ARE HOLDING 5000 ITEMS AND QUOTATIONS ARE GIVEN FOR LARGE QUANTITIES. Please send 1 P&P and VAT at 171/2%. Govt, Colleges, etc. Orders accepted. Quotations given for large quantities. Please allow 7 days for delivery. All brandnew Components. All valves are new and boxed. Prices quoted are subject to stock availability and may be changed without notice.... _ TELEVISION APRIL 1993

9 VIDEO SERVICE KITS AMSTRAD VCR7000 Contents BELT SET. PINCH ROLLER, REEL IDLER. VIDEO LAMP Order Code: SK41 FERGUSON & JVC 3V42/43 HRD455/H Contents BELT SET, PINCH ROLLER, CLUTCH MECHANISM. TENSION BAND Order Code: SK Economy Kit Contents BELT SET. PINCH ROLLER SUPPLY CLUTCH. TAKE UP CLUTCH Order Code: SK V58/59/64/65 HRD170/180/210/230/300/320/370/400/430/530700/750 HRS5000 Contents BELT SET, PINCH ROLLER. IDLER ARM TENSION BAND Order Code: SK44 3V29/3V30 H R7200/7300/7350 Contents BELT SET. PINCH ROLLER TENSION BAND. IDLER TYRES Order Code: SK05 3V35/36,38/39/49 HRD110/111/120/121/225 Contents BELT SET. PINCH ROLLER TENSION BAND IDLER TYRES Order Code: SK04 3V31/3V42 HR7600/ /7655 Contents BELT SET. T/U REEL TABLE TYRE. PINCH ROLLER. REEL IDLER. T/U CLUTCH. T/U IDLER, TENSION BAND. VIDOE LAMP Order Code: SK V35/36/38/39/49 HRO110/111/120/121/225 Contents BELT SET. T/U REEL TABLE TYRE, SUPPLY REEL TABLE TYRE. PINCH ROLLER. T/11 CLUTCH. T/U IDLER. REEL IDLER. TENSION BAND Order Code: SK V29/3V30 HR7200/7300/7350 Contents BELT SET. T/U REEL TABLE TYRE. SUPPLY REEL TABLE TYRE. PINCH ROLLER. REEL IDLER. T/U CLUTCH. T/U IDLER. TENSION BAND. VIDEO LAMP Order Code: SK V44/45/4B/53/54/55/57 HRP50/HRD140/150/158/160 HRD250/257/565/566/755 Contents BELT SET. PINCH ROLLER. CLUTCH MECHANISM. TENSION BAND Order Code: SK FISHER FVHP905/906/907/908/910/911,916/918 Contents Economy Kit Contents BELT SET. PINCH ROLLER. BELT SET. PINCH ROLLER, IDLER. GEAR IDLER UNIT. IDLER TYRE TENSION BAND Order Code: SK Order Code: SK VIDEO SERVICE KITS (Cont.) HITACHI VT52/61 /62/63/64/65/85/86/640 Contents Economy Kit Contents VC3o1 Contents BELT SET. PINCH ROLLER BELT SET PINCH ROLLER. BELT SET PINCH ROLLER f5.50 FF/REW ARM, CLUTCH PLATE FF/REW IDLER REEL IDLER. TENSION BAND. TENSION BAND VIDEO LAMP Order Code: SK Order Code: SK Order Code: SK VT400/405/410/13/14/15/18/420/25/26/28/430/31/35/38/450/498/ 510/520/25/26/530/35/36/540/545/46/48/570/75/576/580/85/88 Contents TIMING BELT PINCH ROLLER. FF/REW ARM CLUTCH EASE. TENSION BAND Order Code: SK VT100/110/ /115/118/120/125/128/130/135/138/145/150/ 175/220/225/250/255258/260/VTL30 Contents BELT SET. PINCH ROLLER. FF/REW ARM. CLUTCH PLATE. TENSION BAND Order Code: SK PANASONIC NV2000/NV2010 Contents BELT SET. PINCH ROLLER TENSION BAND. IDLER TYRES Order Code: SK Economy Kit Contents BELT SET. T/U REEL TABLE TYRE. PINCH ROLLER. REEL IDLER TYRE, PU IDLER TYRE. T/U CLUTCH Order Code: SK Economy Kit Contents BELT SET, T/U REEL TABLE TYRE. SUPPLY REEL TABLE TYRE. PINCH ROLLER CLUTCH, TN IDLER TYRE. REEL IDLER TYRE Order Code: SK36 f6.50 Economy Kit Contents BELT SET. PU REEL IDLER TYRE. SUPPLY REEL TABLE TYRE. PINCH ROLLER. REEL IDLER TYRE T/U IDLER TYRE. TN CLUTCH Order Code: SK Economy Kit Contents BELT SET. PINCH ROLLER Order Code: SK HITACHI VT11 /VT33 Contents BELT SET. PINCH ROLLER. TENSION BAND. IDLER TYRES Order Code: SNOB VT11/33 Contents BELT SET. T/UP REEL TABLE TYRE, SUPPLY REEL TABLE TYRE. PINCH ROLLER. FF/REW IDLER. CLUTCH PLATE, TENSION BAND Order Code: SK NV7000/NV7200/NV7800 Contents BELT SET. PINCH ROLLER, TENSION BAND. IDLER TYRES Order Code: SK NV300/NV330/NV333/NV340/NV366 Contents BELT SET. PINCH ROLLER. TENSION BAND. IDLER TYRE Order Code: SK01 NV2000/NV2010 Contents BELT SET PINCH ROLLER. FF IDLER. PLAY IDLER. TENSION BAND. VIDEO LAMP Order Code: NV7000/NV7200/NV7800 Contents BELT SET. PINCH ROLLER. IDLER UNIT. PLAY IDLER. TENSION BAND Order Code: Skit NV300/NV330/NV333/NV340/NV366 Contents BELT SET, PINCH ROLLER. IDLER UNIT. PLAY IDLER. TENSION BAND Order Code: SK Economy Kit Contents BELT SET. PINCH ROLLER. IDLER TYRE. PULLEY TYRE VIDEO SERVICE KITS (Cont.) SHARP Economy Kit Contents BELT SET. PINCH ROLLER FF/REW IDLER TYRE. T/UP REEL TABLE TYRE. SUPPLY REEL Order Code: SK21 NV777/NV788 Contents 7.00 Order Code: SK22 Economy Kit Contents 3.50 TABLE TYRE BELT SET. PINCH ROLLER. BELT SET. PINCH ROLLER. IDLER UNIT TENSION BAND IDLER TYRE YF-225 VHS IRAN Order Code SK Order Code: SK17 OAT* 7.50 Order Code: SK YF-225B LTD BETAMAX 5.50 Order Code: Economy Kit Contents BELT SET PINCH ROLLER. IDLER TYRE. CLUTCH TYRE Order Code: SK Economy Kit Contents BELT SET. PINCH ROLLER. IDLER TYRE. PLAY IDLER TYRE Order Code: SKIS NVG7/NVG9/NVG1OINVGII/NVG12/NVG14/NVG15/NVG16 NVG18/NVG30/NV0120/NVG130/NVG400/NVH65 IP< AC AG1810 (P/K) Contents LOADING BELT CAPSTAN BELT. PINCH ROLLER. IDLER. TENSION BAND Order Code: SK NV332 Contents BELT SET PINCH ROLLER. PLAY IDLER, FF'REW IDLER. TENSION BAND FF/REW TYRE Order Code: SK Economy Kit Contents LOADING BELT. CAPSTAN BELT. PINCH ROLLER. IDLER TYRE Order Code: Sk Economy Kit Contents BELT SET. PINCH ROLLER PLAY IDLER TYRE FF'REW IDLER TYRE Order Code: S NV230250'260'280/430/450/460/470/650/810/89C AG I 200PK'AG I 500PK Contents Economy Kit Contents BELT SET. PINCH ROLLER. BELT SET. PINCH ROLLER IDLER, TENSION BAND IDLER TYRE Order Code: SK Order Code: SK NV600/NIV688 Contents Economy Kit Contents FVHP615/618/620/622/710/711/715r716/720/721/722/725/ BELT SET. PINCH ROLLER. BELT SET, PINCH ROLLER. PLAY IDLER. FF/FIEW IDLER. PLAY IDLER TYRE. FF/REW 730/830/840 TENSION BAND IDLER TYRE Contents Economy Kit Contents Order Code: SK Order Code: SK BELT SET. PINCH ROLLER. BELT SET PINCH ROLLER. IDLER. GEAR IDLER UNIT. IDLER TYRE NV730/NV770 TENSION BAND Order Code: SK Order Code: SK Contents SLOT IN BELT. LOADING BELT. Economy Kit Contents SLOT IN BELT LOADING BELT PINCH ROLLER. IDLER UNIT. PINCH ROLLER. IDLER TYRE TENSION BAND Order Code: SK Order Code: SK NV370/380/480/630/780/830/850/AG2100PK/AG2200PK 6.00 Contents Economy Kit Contents BELT SET. PINCH ROLLER. BELT SET. PINCH ROLLER. IDLER. TENSION BAND IDLER TYRE Economy Kit Contents BELT SET PINCH ROLLER. REEL IDLER TYRE Order Code: SK vc501/c571,143581,vc582nc583nc584 VC5F3 Contents Economy Kit Contents BEL1 SET PINCH ROLLER. BELT SET, PINCH ROLLER REEL IDLER. TENSION BAND REEL IDLER Order Code: SK Order Code: SK61 EN 50 VC731NC781a1/C782 VC7822,85A/C786 VC 7931/C800 VCA1OONCA1C2 VCA104,VCA202 Contents Economy Kit Contents BEL E SET. PINCH ROLLER. BELT SET PINCH ROLLER REEL DRIVE 1.1.4IT TENSION REEL DRIVE UNIT TYRE BAND Order Code: s Order Code: SK VC681NC682.VC684/VC685 VC693 VC699 NC6F3,1/C700 Contents Economy Kit Contents BELT SET. PINCH ROLLER. BELT SET. PINCH ROLLER REEL DRIVE UNIT TENSION REEL DRIVE UNIT TYRE BAND Orter Code: S4( Order Code: SK THIS 'MONTH SPECIAL OFFERS STK STK7563F 8.30 STK STK STK TA8205AH STK TA8210AH 325 STK TA8215H 3.75 STK TA8216H 3.75 STK TIPL791A f0:80 STK VIDEO REEL MOTOR PU51381V v29. 3v30, 3v31, 3v32, 3v39, 8930, 8931, 8941, 8942, HR7200 HR7300, HR7600, HR7610, HR7650, HR7655 HITACHI VIDEO HEAD VT11, VT14, 16, 30, 33, 34, 330, 340,503, 640, 5030 MITSUBISHI VIDEO HEAD HS3133, 304, 320, 700 HS306, 318, HS300, 301, 302, HS:337, PHILIPS CASSETTE LIFT ASSEMBLY DV , 286, 471, 562,761, VR6180, 6182, 6185, VR6286, 6290, 6291, 6293,.6362, 6367, 6393, VR6467, 6438, 6470, 8561, 6670, 6760, 6761, 6870, 6970 PRESEURE ROLLER ASSEMBLY V18E. DV190, DV286, DV486, DV471. DV582, DV571, DV761., VR6180, VR6182, / VR6285. VR6290, VR6291, VR6293, VR6362: VR6367, VR6390. VR6391, VR6343, VR6467, VR6468. VR6470, VR6561, VR6570, VR6511. VR6670, VR667E VR6760, VR6761, VR6762, VR68-0, VR6970, VR6975, VR8681, 63S137, 68S B4, 71S13, 72SB8 92SB31 7. VIDEO HEAD TESTER _ Mechanical Position of Pointer 2. Scale Plate 3. Painter Adjusting Screw 4. Pointer C4, 5. Measuring Socket 8. Power ON/OFF end Battery Check Switch 7. Range Selector 'Rotary Switch 8. CAL. ADJ (calibration volume) 9. Measuring Clip PRICE VAT VAT K.P. HOUSE, UNIT 15, POP IN COMMERCIAL CENTRE, SOUTHWAY, WEMBLEY, MIDDLESEX, ENGLAND Telephone: Telex No: (Sunmit) Fax: Access & Visa Card accepted. Open Monday to Saturday. TELEVISION APRIL

10 VIDEO HEADS AKAI VSF600, VSF650 AMSTRAD VCR8800, VCR8804, VCR9340 JVC HRD330, HRD337, HRD440, HRD637, HRD641, HRD660, HRFC100 MITSUBISHI HSE12, HSE22, MX1 HS411EZ, HS411GZ NATIONAL NV8050, NV8051 N.E.C. DX2000 DS6000 SAMSUNG VM1560, VN1561 SANYO VHR7900 SHARP VC585, VC685 VC9OET VFH815 SONY SLV373UB TOSHIBA V660 V880MS V700G V500G, V509G V9680 V300G, V301, V305, V309G V61, V63 V110, V120, V130, V140, V210, V220 TELEVISION ON/OFF MAINS SWITCHES Baur, Normende, Nova, Pioneer, Quelle, Saba, Salora, TEC, Thomson & Vega VIDEO MOTORS HITACHI VT11, VT14, VT15, VT16, VT17, VT19, VT35, VT39, VT57, VT88 (capstan motor) BANG & OLUFSEN VHS65, VHS90 (capstan motor) CASSETTE HOUSING AKAI VS35, VS53, VS55, VS66, VS75 FERGUSON FV31R JVC & FERGUSON HRD515, HRD520, HRD527, HRD540, HRD550, HRD580, HRD600, HRD610, HRD620, HRD660, HRD670, HRD830, HRD840, HRD850, HRD860, HRD4050, HRD6600 & FV37H IC TRANSISTORS M491BB1 SAA5243PE TIP112H UPC1488H STR4090A REMOTE CONTROLS AKAI RC-V10A RCV37B V25A BUSH 2020T, 2114T, 2321T, 2514T 2020, 2114, 2321, 2514 DECCA RC70 FISHER RC905B GRANADA/REDIFFUSION UNIVERSAL, 79500C, SATELLITE MK4 TEXT, 70115G, 70133G, 70357E MK4A TEXT, 70375C 95288E 94490D JUST ARRIVED 3800P 2400P 2200P 2400P 2900P 2800P 3400P 3500P 2200P 3600P 2300P 3900P 2800P 3000P 2350P 2600P 3700P 2500P 2900P 2550P 1700P 1800P 375P TP390, TP610 TP621 TP630, TP650 TP660 TP661 HITACHI CLE800-CLE830 A617402/ A512120/230 A A A SCL002 C2096 A H ITT IFB13, 14, 15 FS4 RG305 RG306 FS9/1-10/1 VS5 RUK VS4-1 MULTICONTROL (17C20) KORTING 18279, 18396, 18460, SE VTS LOEWE DC11 MATSUI VX770 METZ JAVA COLOR (6890) COLOR (7156) JAVA (7180) MITSUBISHI 939P/03607, 939P/03609 NOKIA SATELLITE NORDMENDE TC P CMC1, TC3519 OCEANIC 3100P 390C9500 ORION RC53 PANASONIC 2600P EUR51200 TC P VSQ0357/NV730 TNQ1621 PHILCO CARVEL, CONCORDE, MERCURY TELESTAR TC P PHILIPS RC5002, 5154 KT3 NON TEXT 500P P P 150P 650P GRUNDIG TP160E TP200, TP300 TP400 TP RC5991 UNIV RC3B KT3 TEXT RC5352 RC5375 RC5 STANDARD RC5901 RC5903 SABA T6772 TC TC356 TC P TC360 TC P 850P 850P SALORA SERIES L SANYO RC218, RC222, RC228, RC238 JXGE JXDE VHR2300 RC628 SEE PREVIOUS PAGES FOR MORE GRANDATA BARGAINS 1050P 850P 1050P 1050P 1050P 1050P 1050P 900P 1COOP 900P 850P 900P 900P 900P 900P 900P 900P SHARP G01210ESA, 123CESA, 204, 251 SIEMENS FC616 FC631 FC742 SONY RM604, RM605, RM CHANNEL RM613 RM632, RM636 TATUNG FXA RC70 FX70 FASTTEXT TELEFUNKEN FB632 FB639 THORN/FERGUSON 3V V V57-58 TX10 TEXT TX10 STEREO TEXT TX V55, FV11 TX100 FASTTEXT TX100 STEREO FASTTEXT PROFESSIONAL TOSHIBA CT937 CT R4B UNIVERSAL PROGRAMMABLE REMOTE CONTROL Controls up to 4 different devices which use infra red remote controls including TV, audio, VCR and satellite. (Need original remote control to program) Order code: IR1OOR Price: 1950P We stock Remote Controls for over 5000 different models. Ring for further details on LINE OUTPUT TRANSFORMERS 1050P Description Price Order 1050P Code 900P 900P 1050P 900P 900P 1050P 1050P 850P 900P 900P 900P 900P 900P 900P 900P 1050P 1050P 1050P 900P HITACHI ORION FIDELITY ZX300 FE TX DEG SABA FE TX90 WHITE ITT D307/37 EQ BLAUPUNKT 210 GRUNDIG ITT CVC800/1/3 ITTD218/37 EQ NORMENDE 5255 SABA SALORA T236 EQ SABA SABA TELEFUNKEN AT1 TELEFUNKEN EQ SALORA FM0218B NORMENDE 5255 ITT CVC 1150/1 ITT COMPACT 80 FE TX100 GREEN HINARI CT4/ SELECO BLAUPUN KT 8667 ITT COMPACT B1 ITT CT3326 MUL ITT D066/37 EQ ITT 3546 EQ LUXOR SABA HITACHI CP FE TX D HANTAREX SHARP C3700 EQ HITACHI CP 1500P 1500P 1500P 1500P 1500P 1650P 1600P 1600P 1600P 1500P 1600P 1600P 1600P 1650P 1600P 1600P 1450P 1400P 1600P 1600P 1500P 1500P 1450P 1500P 1600P 1600P 1450P 1500P 1600P 1500P 1600P 1600P 1450P 1700P 1600P 1600P 1500P 900P 900P 900P 900P 900P 900P 850P 900P 900P 1050P 850P 850P 850P 1050P 900P 900P 850P LOTO1 LOTO2 LOTO3 LOTO4 LOTO5 LOTO6 LOTO7 LOTO8 LOTO9 LOT10 LOT11 LOT12 LOT13 LOT14 LOT15 LOT16 LOT17 LOT18 LOT19 LOT20 LOT21 LOT22 LOT23 LOT24 LOT25 LOT26 LOT27 LOT28 LOT29 LOT30 LOT31 LOT32 LOT33 LOT34 LOT35 LOT36 LOT37 We stock line output transformers for over 100 different models. Please ring for more information. GRANDATA LTD K.P.HOUSE, UNIT 15, POP IN COMMERCIAL CENTRE, SOUTHWAY, WEMBLEY, MIDDLESEX, ENGLAND Tel Fax: TELEVISION APRIL 1993

11 ALGA ELC EAST LONDON COMPONENTS AUDIO TELEVISION VIDEO COMPONENTS AT VERY KEEN PRICES TEL FAX REMOTE CONTROLS FROM 9.99 moiler tura ARAI IDLER TYRES VS1/2/5 1. VIDEO HEADS FROM 6.99 VS22/ Over 200 models at very attractive prices. VS105/250 LINE OUTPUT TRANSFORMERS DEOCA FERGUSON TX TX90 DSPOT 1939 WHITE SPOT 1439 TX TX100 GREEN SPOT 1415 BLUE SPOT YELLOW SPOT FST ICC MIER F , RDELITY ARAL AMSTRAD, FERGUSON, FISHER 110 GOLDSTAR MARI, HITACHI, LOGI. AMSTRAD MATSUL ORION, PANASONIC, SAISHO, VCR VCR SHARP AM) NAPPY MOREVCR VIDEO SPARES 14. TO 20' V2517AKE UP IDLER E1.001) 3V A V29 F/F REW IDLER L2.110p 3V29/30/ HINARI 3V506 FV1CY14 IDLER 1. 3V42/ C74/ V23 LOADING ROLLER BAR E333p HRD520/ HITACHI CPT SHARP 0005 & ,95p FISHERS CPT SHARP VC651 ASSEMBLY pump FYHP615/ CPT fix, FYHP905/ V711/14/17 IDLER CPT1471 zass VT11 CLUTCH ASSEMBLY CiRUNOIG CPT YS CPT VT IDLER YS CPT CTP7133 $5.00 NEC Y53B CPT CTP7135 MOO SANYO VHR3300 IDLER 13.99p AKA V CLUTCH ASSEMBLY E11.99p 1/11ARI CPT CBF' , CPT SARA CPT S HA STK SAA TDA C SAISHO CLUTCH HA P vx1.435 ISO CP SCHNEIDER 600 STX4C TDM503 MITSUBISHI/15337 RV IDLER fixip HITACHI C S7V1500 HA ST1( SAA A4505 3Y 3.00 R C S2000AF SC HA S11(4/22 SOO TA TDA4505 4Y 400 S2055AF SC ALGA SENTRA PULLEY "35P 'al iiss 130 CPT SENTRA HA ST1( TA TDA4505 E 5.99 T1PL761A SC MATSUI UMITER POST CPT2234 "25P risziss 1919 G)( S HAI STK TA TDA4505 M TIPL791A SC PANASONIC NV370 IDLER CPT SOLAVOX E1260 yr1 lam 110 HA STX TA TIP SC CPT RSHER 615 IDLER HAI STX4)41V TA A TIP P MITSUBISHI CPT HA STK TA N FISHER GEAR ASSEMBLY MOP HS306/ CPT HA TK TA TDA AMSTRAD PINCH WHEEL MOD KR E599p lamps CPT SONY HA _99 57X TA TDA SA ) UNIVERSAL TRIPLER EARN YR ITT KV HA STK4T61I 9.99 TA TDA A UNIVERSAL TRIPER WITH FOCUS E799p yr CVC KV16XHTU HA13403V 5.50 STX TA TDA SA SC/ CVC26/ KV HITACHI MODULE H LA STI(4171I 9.99 TA TDA SA E9390 UNSUNG COMPACT KV LA X4/ TA TDA SA SD CUC2410 TRIFLER E1491 VX BOR LA ( TA TDA SA TENSION BAND FOR MOST MOO. FROM 1 SANYO FST 1099 LA STI( A L011CLP 120 2SA D CIRCUIT PROTECTOR ICP 50P VHR CVC TA TMS47C SA TX10 FOCUS UNIT E7.99p VHR PHIUPS BACK-UP BATTERY El. SHAW ALBA BATTERY.1F 5.5V E2. VC CT TV SWITCHES FOR MOST MOD. FROM E1.00p VC651/ FX SONY FUNCTION SWITCH E1.00p VC FX ELC EAST LONDON COMPONENTS 63 PLASHET GROVE, EAST HAM, LONDON E6 1AD. TEL: two minutes walk from Upton Park Tube Station PLEASE PHONE US IF WHAT YOU NEED IS NOT LISTED AS WE HOLD THOUSANDS OF ITEMS IN STOCK ADD ft P/P ADD 17.5% VAT ALL GOODS DESPATCHED SAME DAY PRICE SUBJECT TO CHANGE WITHOUT NOTICE VISA ACCESS ACCEPTED. MIN ORDER 5.00 SFX SFX ST TX TX TX T)( MATSUI MITSUBISHI CT LOEWE OPTA CLASSICS STUDIO T M PHILIPS KT K KAO A A 1910 CP CTXE TIM CTXS SAtS140 C CT142RX CT149TX SANYO CTV KV2212 KV2217 KV2252 DIGI KV2704 DIGI $9 KV2705 CT KV TELEFUNKEN AS7OPV P390CV V CASSETTE HOUISING VT33/ VT17/88 TTE HOUSING VT40(3800 VT400/800 HOLDER CASSETTE 10E BRACT VR6462 ETTE HOUSING 131,13614c7AMENTTE VilOWSING 19_ V65 CAPSTON,T8R vy11/33/65 CAPST MOTOR 2414 VT110/150 CAPSTON MOTOR V7500 CAPSTAN MOTOR 2039 VT600/700 CAPSTON MOTOR MVG SERIES PINCH ASSEMBLY MITSUBISHI ASSEMBLY 1939 VR6367 Fl NCHWHE EL RACK VR6367 MODIFICATION KIT CHARLIE LOADING GEAR 610 VIDEO HEAD PULLER 909 VCR CICLI PS & SPRING KIT 5.50 AN3822K 719 LA ( TDA UPC AN M STK A UPC AN5435 2_50 M STK TDA UPC AN M S1X TOA UPC AN M S1X P3A UPC AN M5840A STK TOA UPCI AN M54543L TDA X2402P AN M54544L 2.99 ST TDA SG264A THY S AN M54545L 2.99 STK TDA SG613 THY BA M54548L 425 STK73410 ILM TL/A TRANSISTORS BA M545/9L 4.50 STR DA BC BA M STR A BC BA M54647L 3,99 STR TDA BF SC BA M54648L 3.99 STR '0A BL1208A SC BA M STR DA U SC BA M ST DA BU SC BA MB /R TDA AF 130 2SC1413A 2.40 BA MB STR A BU5080F 130 2SC A MC133C STR TDA BU508DR SC BA MDA STR rda BU SC _50 MDA STR A SC BA6239 BU BA63: STK TDA Btfr11A 015 2SC ( STR TDA AF 120 2SC BA STK STR A 120 2SC BA STR TDA BUK SC BA ( STR TDA BUX C ( S1FI TDA BUW11A SC CNY ( STR TDA DTA SC CNY75 2_99 STI( SAA TDA DTA SC CNX62A 299 STK SARI T0A C CNX ( SAA TDA DTC CNX STX DTC SC HAI STK SAA TDA DTC HAI ST1( SA TDA MJ SC HA STX SAA T0A MJE HA STX SAA EM MJE HA ST1( SAA501C 430 TDAA MN SC LA.400 LA446LA ( (4372 STK TA7293 TA7295 TA UPA8IC UC3841 U SA1095 2SA1102 2SA LA ST TA UPC SA LA STX TA UPC SA LA STK TA UPC SA LA T TA UPC SA1208 1_50 2S LAMM 399 STK TA UPC SA ' 0.50 LA STX UPC SA ) LA STX TA UPC SA LA !. UPC SA LA UPC LA STK TA UPC E LA STK TA84C UPC V 2.75 LA STK TEAIC UPC LA STP TEA UPC E LA ST1( E0,2029 UPC S LA ( TEA2' 64 UPC E LA STX A1037 UPCI LA STK TDA1O UPCI LA ( TDAI17O 1.90 UPC : LA ST( TDA UPC LA IDA ' UPC E REMO-E TESTER E1499 L.DPT TESTER VIDEO HEAD TESTER E ABBEY STREET ACCRINGTON, LANCS BB5 1EE FAX Hr Answering Service LARGE S A Full range of specialist amplifier VALVES - e.g. EL34 KT88 etc ONE OF THE LONGEST ESTABLISHED MAIL ORDER SUPPLIERS, WE CONTINUE TO GIVE FAST, FAIR AND EFFICIENT SERVICE. TRAIUNG LEADS 8 SOCKETS 4 WAY 9 FT EXTENSION LEAD WHITE 4 WAY 2 MTR EXTENSION LEAD WHITE 2 WAY 2 MTh EXTENSION LEAD WHITE 2 WAY 9 FT EXTENSION LEAD WHITE 1 WAY 25 FT EXTENSION LEAD WHITE 4 WAY SOCKET WITH NEON LIGHT UNFUSED 4 WAY SOCKET WITH NEON FUSED WHITE 1 WAY SOCKET WHITE 2 WAY SOCKET WHITE WITH NEON LIGHTING 1 GANG 1 WAY WALL LIGHT SWITCH WHITE 2 GANG 2 WAY WALL LIGHT SWITCH WHITE 1 GANG 2 WAY WALL LIGHT SWITCH WHITE 5 AMP PULL CORD LIGHT SWITCH WHITE CEILING ROSE WHITE TI PENDANT LAMP HOLDER CORD GRIP CEILING PENDENT SETS 6 INCH WHITE CEILING PENDENT SETS 9 INCH WHITE STRIP LIGHT WHITE NIGHT LIGHT WITH LAMP WHITE BASE PLATE BATTEN WHITE BASE PLATE BATTEN HOLDER WHITE SOCKETS TWIN GANG 13 AMP SWITCHED WHITE TWIN GANG 13 AMP UNSWITCHED WHITE SINGLE GANG 13 AMP SWITCHED WHITE SINGLE GANG 13 AMP UNSWITCHED WHITE PATRESS BOXES SURFACE SINGLE GANG 25MM DEEP WHITE SINGLE GANG SHALLOW WHITE TWIN GANG 25MM DEEP WHITE C2.00 f f C CALLERS WELCOME AT TRADE COUNTER Mains Plugs 3 AMP FUSE WHITE 5 AMP FUSE WHITE 13 AMP FUSE WHITE PER 100 MOSS WIRELESS SECURITY SYSTEM Remote control with cordless detectors VAT WHEN ORDERING: PLEASE AND 2.00 P/P TO ORDER TOTAL THEN ADD 17.5% VAT TO THIS TOTAL WE HAVE STOCKS OF * EX -RENTAL TVSNIDEOS * TELEVISION COMPONENTS * VIDEO COMPONENTS * REMOTE CONTROLS * CABLES, LEADS, PLUGS etc C0.66 * AERIALS AND ACCESSORIES 0.60 * HOME SECURITY PRODUCTS C1.25 * DEGAUSSING COILS!! MON-FRI 9-5pm SAT pm MAKE YOUR INTERESTS PAY! Train at home for one of these Cared' Opportunit,es Over the past 100 years more than 10 million students throughout the world have found it worth their while! An ICS home -study course can help you get a better job, make more money and have more fun out of life! ICS has over 100 years experience in home - study courses and is the largest correspondence school in the world. You learn at your own pace, when and where you want under the guidance of expert 'personal' tutors. Find out how we can help YOU. Post or phone today for FREE INFORMATION on the course of your choice. (Tick one box only!) Electronics Basic Electronic Engineering (City & Guilds) Electrical - Engineering Elec. Contracting/ Installation _ TV, Video & Hi-Fi Servicing F: Refrigeration & Air Conditioning _ Car Mechanics,_. Computer Programming GCSE/GCE/SCE over 40 examination subjects to choose from Name: Address: ICS P. Code International Correspondence Schools, Dept. E3S43 312/314 High Street, Sutton, Surrey SM1 1PR cr (24 hours) TELEVISION APRIL i--, -1

12 WE WILL ONLY SUPPLY TOP QUALITY, BRANDED COMPONENTS. REPUTATION COUNTS WITH US AERIAL ACCESSORIES COAX LINE CONNECTOR.18 COAX PLUG.18 F CONNECTOR.20 FLY LEAD 2M 75 PHILIPS AERIAL SKT.8.95 SATELLITE IF AMP IN LINE 7-11 DB GAIN VIDEO LEAD 2M.75 V SPLITTER WAY DISTRIBUTION AMPLIFIER MAINS WAY DISTRIBUTION AMPLIFIER MAINS BATTERIES AVO TESTERS 15V AA tpktof 4) 1.15 AAA(pkt of 4) 1.15 FERGUSON 3V GRUNDIG VIDEO 11, J SIZE 6V 2.95 N SIZE (MN9100) 95 PHILIPS MEMORY 1V PHILIPS MEMORY 2V PP CAPACITORS v (back-up) v tut at 63v at 63v at 63v at at 63v v uf at 250v u1 at 250v al 250v at 250v 40 33E11 at 250v at 250v at 250v uf at 400v at 400v at 400v 70 22o1 at 400v xis (All PCB Mounting) DIODES R2M 95 BV BY Y229/ Y299/ IN IN FaX61C (Pat 01 5) v.15v. 24v. 33v. 68v. 120v AKAI VIDEO SPARES VS1/5 BELT KIT 1.95 PINCH ROLLER 3.95 REEL IDLER UNIT 6.95 TAKE UP CLUTCH 8.95 TENSION BAND 2.95 VIDEO HEAD VS1/ VIDEO HEAD VS ALBA VIDEO SPARES VCR4000 BELT KIT 1.95 CAPACITOR BACK-UP 1.85 PINCH ROLLER 3.95 REEL IDLER 3.95 REEL PULLEY 1.95 REPAIR KIT TENSION BAND 2.50 VIDEO HEAD VCR5000 BELT KIT 1.95 PINCH ROLLER 3.95 REEL IDLER 3.95 REEL PULLEY 1.95 TENSION BAND 2.50 VIDEO HEAD VCR6000 BELT KIT 1.95 CLUTCH ASSEMBLY 4.50 PINCH ROLLER 3.95 REEL IDLER 4.50 REPAIR KIT TENSION BAND.2.50 VIDEO HEAD EHT TRAYS CONTINENTAL 30AX FOCUS 8.95 DECCA 120/ GRUNDIG CUC ' GRUNDIG CUC ' PHILIPS KT THORN UNIVERSAL 5.95 FUSES 20mrn AS (POTS OF 10) MA. 315MA. 500MA. 630MA 800MA. IA. 1.6A. 2A. 2.5A, 3.15A. 4A. 5A, 6.3A. 8A n10/13 (POTS OF 10) MA. 630MA. 800MA. 1 A. 1.6A.2A2.5A.3.15A 60 ICs CNX62A 3.30 CNX83A 3.95 HA HM MSM5840H/84RS SAA SAA SM1293A SAA3027P 6.95 SL SL SL STX STK STK STK STK STK STK STK STK STK STK STK STK STK STR STR STR STR STR50103A 5.50 STR STR STR STR STR6020 (KIT) 5.95 TDA1 035T 2.50 TDA TDA TDA TDA TOA1670A 3.95 TDA1770A 3.95 FERGUSON VIDEO SPARES 3V29/30 BELT KIT 1.95 CAPSTAN MOTOR CASSETTE LAMP 70 LOADING BELTS (5) 1.95 PINCH ROLLER 3.95 REPAIR KIT REEL IDLER 2.95 TAKE UP CLUTCH 2.95 TAKE UP IDLER 1.95 VIDEO HEAD V35/39 BELT KIT 1.95 CAPSTAN MOTOR CASSETTE HOUSING LOADING BELTS (5) 1.95 MAINS TRANSFORMER PINCH ROLLER 3.95 REEL IDLER 2.95 REPAIR KIT TAKE UP IDLER 1.95 TAKE UP CLUTCH 2.95 VIDEO HEAD V44/45 BELT KIT 1.50 CASSETTE HOUSING PINCH ROLLER 3.95 REMOTE CONTROL REPAIR KIT VIDEO HEAD V65/FV11 BELT KIT CAPSTAN MOTOR CASSETTE HOUSING PINCH ROLLER REEL IDLER REPAIR KIT VIDEO HEAD G.G.L. COMPONENTS PO BOX 72, UNIT 7, SOUTH JOHN STREET, CARLISLE, CUMBRIA CA2 5AL. TEL: (0228) 39693/20358 Fax: (0228) TDA TDA2005. TDA TDA TDA2576A 3.50 TDA TDA2577A 3.50 TDA2578A.2.95 TDA TDA TDA TDA TDA TDA2653A TOA TOA TOA3561A 4.05 TDA3562A (TFK) 4.75 TDA TDA TDA TDA TDA TDA3651/ TDA3651A TOA3653A 3.50 TDA3654A.2.95 TDA TDA4501H 5.95 TDA TDA4505E TDA4600/3.295 TDA4600/2D 3.95 TDA TEA2018A.2.50 TMP47C434N TMP47C434N TMP47C434N IMP47C434N »._15.55 TMP47C434N TMP47C434N UPC UPC1378H 3.25 UPC1394C 295 CIRCUIT PROTECTORS N10.N20 N25 (each) SO EXTENSIVE RANGE OF NEW MICROPROCESSORS NOW AVAILABLE PLEASE REQUEST DETAILS HITACHI VIDEO SPARES VT8000/8700E BELT KIT 1.95 CAPSTAN MOTOR FF/REW IDLER 2.95 FF/REW PULLEY 95 PINCH ROLLER 3.95 PLAY IDLER 3.95 REEL TABLE 3.95 TENSION BAND 2.95 VIDEO HEAD VT9300/9700E BELT KIT 1.95 CAPSTAN MOTOR FPREW IDLER 2.75 FF/REW PULLEY 95 PINCH ROLLER 3.95 PLAY IDLER 3.95 REMOTE CONTROL TENSION BAND 2.95 VIDEO HEAD VT11/33E AUDIO HEAD VT11E AUDIO HEAD VT33E BELT KIT 1.95 CAPSTAN MOTOR VTI1E CAPSTAN MOTOR VT33E CASSETTE HOUSING CLUTCH ASSEMBLY 7.95 FF/REW IDLER Genuine 2.50 PINCH ROLLER 3.95 REPAIR KIT RF CONVERTOR VT11E TENSION BAND VIDEO HEAD VT63/64E 2.75 BELT KIT CAPSTAN MOTOR AMSTRAD VIDEO SPARES VCR4500 CASSETTE HOUSING BELT KIT CLUTCH ASSEMBLY FF/REW IDLER GEAR ASSEMBLY FISHER VIDEO SPARES PINCH ROLLER MODIFICATION KIT FVH5000 PINCH ROLLER REMOTE CONTROL BELT KIT 2.20 VIDEO HEAD SERVICE MANUAL REEL IDLER 5.50 TENSION BAND VCR4600BELT KIT PINCH ROLLER 3.50 GEAR ASSEMBLY VIDEO HEAD VT63/64E TENSION BAND 2.60 MODIFICATION KIT VIDEO HEAD VT VIDEO HEAD VT120/130E PINCH ROLLER 3.50 FVH615/720 BELT KIT VIDEO HEAD BELT KIT 1.95 VCR7000 CAPSTAN MOTOR CLUTCH ASSEMBLY 5.95 BELT KIT CLUTCH ASSEMBLY PINCH ROLLER LAMP FF/REW IDLER REEL IDLER 5.95 PINCH ROLLER PINCH ROLLER VIDEO HEAD REEL IDLER REMOTE CONTROL VT120E FVH905/910 REPAIR KIT REEL MOTOR BELT KIT TENSION BAND 2.95 VIDEO HEAD CLUTCH ASSEMBLY VIDEO HEAD VT120E VCR6000 REEL IDLER 5.95 VIDEO HEAD VT130E BELT KIT 1.95 VIDEO HEAD FVH PINCH ROLLER 3.95 VIDEO HEAD LINE 0/P TRANSFORMERS FERGUSON 7X90 14' FERGUSON 7X90 20" FERGUSON TOSS FERGUSON TX FERGUSON TX D FERGUSON 7X100 FST FIDELITY Z02000 MOD._15.50 FIDELITY FIDELITY ZX FINLUX 1000 SERIES HINARI CT4/ HITACHI CPTI HITACHI CP71448/ HITACHI CPT2174/76/ TT COMPACT TT COMPACT FST TT CVC TT MONOPRINTA...»...».._..,,1&25 TT MONOPRINT B MATSUI MATSUI C1480A PHILIPS CFI PHILIPS CP PHILIPS CTX14T20' PHILIPS PHILIPS 2A SAISHO CT141R/RA 1&SO SHARP C ALL LOFTS ARE EITHER -KONIG" OR GENUINE MANUFACTURERS *** NEW RANGE*** GENUINE PANASONIC L 0 P TS PANASONIC TC2000 _ PANASONIC TC PANASONIC TC PANASONIC TC PANASONIC TC PANASONIC TC PANASONIC TC PANASONIC PANASONIC TX PANASONIC TX PANASONIC PANASONIC PANASONIC TX PANASONIC TX PANASONIC TX PANASONIC TX PANASONIC 7X PANASONIC TXC MITSIBUSHI, SONY & SHARP LOFTS AVAILABLE PLEASE ASK FOR QUOTE SERVICE MANUALS AMSTRAD 4600 &95 AMSTRAD FERGUSON TOSS 9.95 FERGUSON 3V FERGUSON 3V FERGUSON 3V FERGUSON 3V FERGUSON FV FERGUSON FV12.. FERGUSON FV20 A BUY WITH FERGUSON FV26 FERGUSON FV32 FIDELITY AVS FIDELITY AVS FIDELITY C11/14R 7.85 PANASONIC NV PANASONIC NV PANASONIC NV PANASONIC NVG PANASONIC NVG PANASONIC NVG PANASONIC NVG PANASONIC NVL PANASONIC TX1 995 PANASONIC TX PANASONIC TX24A PHILIPS KT WE ALSO SUPPLY MANUALS FOR: NEC, NIKKAI,SAISHO & SHARP PLEASE RING FOR PRICES SWITCHES AMSTRAD CTV FIDELITY CTV FIDELITY CTV14F FIDELITY CTVI4S 395 GRUNDIG CUC G11 STANDARD 1.35 G11 REMOTE 1.75 ITT TX SERIES 4.95 MATSUI KT3 REMOTE 1.75 KT4/CTX REMOTE 1.75 SAISHO FST SOLARA PCB REMOTE 3.95 SONY KV1612 REMOTE 3.95 SONY KV2022 REMOTE 395 TATUNG TATUNG TATUNG 165 REMOTE 1.75 THORN UNIVERSAL 1.00 TX9/10 STANDARD 1.00 D(9/10 REMOTE 1.75 PANASONIC VIDEO PHILIPS VIDEO SPARES SPARES VR6185/6291 NV230/430 BELT KIT.2.95 REPAIR KIT GENUINE CASSETTE HOUSING BELT KIT 1.95 PINCH ROLLER ASSY 7.50 MODE SWITCH 3.95 REPAIR KIT PINCH ROLLER 3.95 REMOTE CONTROL REEL IDLER GENUINE 2.95 VIDEO HEAD VIDEO HEAD NV VR6367 NV333/366 BELT KIT 2.95 REPAIR KIT GENUINE CASSETTE HOUSING BELT KIT 1.95 PINCH ROLLER ASSY 7.50 PINCH ROLLER 3.95 REMOTE CONTRC PLAY IDLER GENUINE 4.95 REPAIR KIT REEL IDLER GENUINE 1.25 VIDEO HEAD VIDEO HEAD NV VR6450/ NV370 PINCH ROLLER 3.95 VIDEO HEAD NV BELT KIT REPAIR KIT GENUINE REEL IDLER.2.95 BELT KIT 1.95 REPAIR KIT MODE SWITCH 3.95 VIDEO HEAD 9.95 PINCH ROLLER 3.95 VR6462/6560 REEL IDLER GENUINE 2.95 REPAIR KIT VIDEO HEAD 9.95 CASSETTE HOUSING NV730 PINCH ROLLER 3.95 REPAIR KIT GENUINE REEL IDLER GENUINE 4.95 BELT KIT 1.95 VIDEO HEAD GENUINE MODE SWITCH 3.95 VR6467 PINCH ROLLER 3.95 REPAIR KIT GENUINE REEL IDLER GENUINE 3.95 BELT KIT 2.95 TENSION BAND 2.45 CASSETTE HOUSING VIDEO HEAD PINCH ROLLER ARM ASSY NV777 VIDEO HEAD GENUINE REPAIR KIT GENUINE VR6760 BELT KIT 1.95 REPAIR KIT GENUINE PINCH ROLLER 3.95 BELT KIT 2.95 REEL IDLER GENUINE 3.95 CASSETTE HOUSING VIDEO HEAD PINCH ROLLER ASSY 7.50 NV2000/2010 VIDEO HEAD GENUINE REPAIR KIT GENUINE SANYO VIDEO SPARES BELT KIT 1.95 VTC5000 PINCH ROLLER 3.95 BELT KIT 1.00 PLAY IDLER GENUINE 1.25 REEL MOTOR GENUINE 7.95 REEL IDLER GENUINE 1.25 REEL PULLEY GENUINE 5.95 VIDEO HEAD 8.95 VIDEO HEAD NV7000/7200 VHR1100/1300 REPAIR KIT GENUINE BELT KIT.2.25 BELT KIT 1.95 PINCH ROLLER 3.50 PINCH ROLLER 3.95 REEL DRIVE ROLLER 5.95 PLAY CLUTCH GENUINE 4.95 REEL MOTOR REEL IDLER GENUINE 1.25 TENSION BAND 2.60 VIDEO HEAD 8.95 VIDEO HEAD NVG7/10/12 VHR3100/3700 REPAIR KIT GENUINE 9.95 BELT KIT 1.95 BELT KIT 1.95 PINCH ROLLER 3.50 MODE SWITCH 3.95 REEL DRIVE ROLLER 5.95 PINCH ROLLER 3.95 TENSION BAND 2.60 REEL IDLER GENUINE 2.95 VIDEO HEAD VIDEO HEAD NVG7/ T X90,100 STANDARD 1.50 TX90/100 REMOTE 1.75 EXTENDED RANGE OF VIDEO P. AUDIO HEADS RING OR WRITE FOR DETAILD TRANSISTORS BC BC BC337» 10 BC BC BC BC B E BF BF BU208A 1.45 BU208D 1.95 BU BU426A 1.45 BU BU508A 1.50 BU508AF 1.95 BU508D 1.95 BU508DF BU508V 2.75 BU BU BU U BUK44/ BUT11AF 2.75 BUT12A BUT58A 2.75 BUX84 80 R R T9053V 3.50 T9054V 3.50 T9064V 1.95 TIP29E (TO168V( 75 TIP41C» 50 TIP42C 50 TIP112H (T0187V) 75 TIPL791A SC SD1497/ TRANSISTOR EQUIVALENT BOOKS TVT A -Z 8 2N 2SD SHARP VIDEO SPARES VC9300/381 BELT KIT 2.50 PINCH ROLLER 3.95 REEL IDLER GENUINE 3.95 REEL MOTOR GENUINE TENSION BAND 2.95 VIDEO HEAD VC481/482 BELT KIT 2.50PINCH ROLLER 3.95 REEL IDLER GENUINE 3.95 REEL MOTOR GENUINE TENSION BAND 2.95 VIDEO HEAD VC581/582 BELT KIT 2.50 REEL IDLER GENUINE 3.95 PINCH ROLLER 3.95 VIDEO HEAD VC681 BELT KIT 2.50 PINCH ROLLER 3.95 REEL PULLEY GENUINE 7.95 VIDEO HEAD VCAMONCT72 BELT KIT 2.95 PINCH ROLLER 3.95 REEL PULLEY GENUINE 7.95 TENSION BAND 3.50 VIDEO HEAD SONY VIDEO SPARES csan BELT KIT C5/ BELT KIT C PINCH ROLLER 4.50 REWIND KIT C5/ REWIND KIT C VIDEO HEAD VIDEO BELT KITS HINARI VXL3/ HINARI VXL8/ MITSUBISHI HS MITSUBISHI HS NEC SAMSUNG VX SAMSUNG VX SHARP SHARP VIDEO LAMPS FERGUSON 3V00/22 50 FERGUSON 3V29 80 FERGUSON 3V35 LED 1.95 HITACHI VT63E END SNS 1.95 PANASONIC NV SHARP SHARP UNIVERSAL 50

13 TOP TEL PREPROGRAMED REMOTE CONTROLS 5 INDIVIDUAL APPLIANCES TV.VCR 8 SATELLITE ETC PHILIPS UNIVERSAL REMOTE CREDIT CARD SIZE 9.95 WORKS MOST PHILIPS SETS BASIC FUNCTIONS. ENGINEERS MUST npowermid NO WIRES, JUST PLUG IN AND TRANSMIT BY YOUR REMOTE CONTROL TO ANY ROOM IN YOUR HOUSE REMOTE CONTROLS AKAI VS FERGUSON T FERGUSON T FERGUSON T FERGUSON T FERGUSON FERGUSON 1785 FAST TEXT FERGUSON 1789 FAST TEXT FERGUSON 7%10 MATSUI PIONEER 505/ VIDEO HEADS PANASONIC NV NON TEXT MATSUI PROGRAMMABLE AKAI VS1/ PANASONIC NV FERGUSON TX10 TEXT MATSUI PYE DV464/ AKAI VS PANASONIC NV FERGUSON TX10 STEREO NEC N -831/33G PYE DV662/ ALBA 4000X PANASONIC NV FERGUSON TX100 TEXT NEC RB83EG1EP RANK 726A ALBA 6000X PANASONIC NV FERGUSON ICC NIKKAI NT14/20/ RANK T524A AMSTRAD 4500/ PANASONIC NV FERGUSON 3V32/ ORION VH RANK 7528A AMSTRAD 4600/ PANASONIC NV FERGUSON 3V ORION VH3050/6ORC REDIFFUSION MKIV AMSTRAD PANASONIC NV FERGUSON 3V ORION VR2949, REDIFFUSION MKIVA AMSTRAD PANASONIC NV2000/7000._.8.95 FERGUSON SRA ORION VSP SABA FS FERGUSON 3V PANASONIC NVG7/ FIDELITY CTV14S ORION VXL SABA FS603/ FERGUSON 3V PANASONIC NVG10/ FIDELITY CTV22T PANASONIC EUR SAISHO CT142R FERGUSON 3V42/ PANASONIC NVG FIDELITY CTV PANASONIC EUR SAISHO CT149TX FERGUSON 3V59/FV PANASONIC NVG20/ FINLUX 1000 SERIES PANASONIC EUR SAISHO VR1000/1100_ FERGUSON 3V6PFV PANASONIC NVG30/ FINLUX RC PANASONIC C71/C SALORA 16110/ FERGUSON FV PANASONIC NVG FISHER FTS 5610TX PANASONIC TN01411/ SALORA 20J/20/30/ FERGUSON FV PANASONIC NVL FISHER FTS 6310TX SALORA FERGUSON FV PHILIPS VR FISHER FTS 110TX PANASONIC TN SALORA C2OXZ FERGUSON FV PHILIPS VR FISHER FVHP 905/ PANASONIC 7%2112 SALORA SATELLITE FERGUSON FV PHILIPS 6460/ GOLDSTAR OTMF GENUINE SAMSUNG SV FISHER FVH PHILIPS 6462/6560 GOLDSTAR D PANASONIC 7X SAMSUNG SV7I FISHER FVH GENUINE GOLDSTAR C PANASONIC SAMSUNG VX616/ FISHER FVH72S PHILIPS 6467 GENUINE GOLDSTAR GHV PANASONIC 7% SAMSUNG VX619/ FISHER FVF PHILIPS 6760 GENUINE GOODMANS TX1100/ PANASONIC TX2464 SAMSUNG VX627/ GOLDSTAR V1221/ PYE DV GRANADA UNIVERSAL GENUINE SANYO CPT GRUMDIG VS400/ PYE DV GRUNDIG TP400 TEXT PANASONIC 7X2470/72.,..._ SANYO E2 SERIES HINARI VTR REDIFFUSION GRUNDIG TP650 TEXT 1425 PANASONIC TX2482/ SANYO VHR 1100/ HINARI VXL2/4/30/ SAISHO VR705/ GRUNDIG TP PANASONIC 7X SANYO VHR 1300/ HINARI VXL SAISHO VR HINARI C PANASONIC NV230 SANYO VHR 2700/ HINARI VXL8/9/ SAISHO VR HINARI CTI GENUINE SENTRA VCR8000/ HINARI VXLI OH 1/ SAISHO VR HINARI VXL-7/ PANASONIC NV430 SENTRA VX HITACHI 8000/ SAMSUNG VI HINARI VXL GENUINE SOLAVOX 16R HITACHI VT11/ SAMSUNG VX520/ HITACHI CLE862F PANASONIC NV SOLAVOX HITACHI VT17/ SANYO VHR 1100/ HITACHI CLE871A PANASONIC NV870 SOLAVOX 26R HITACHI VT63/ SANYO VHR1110/ HITACHI CLE874A GENUINE SOLAVOX CML HITACHI VT SANYO VHR 2300/ HITACHI CPT PANASONIC NVGIO SONY RM604/ HITACHI VT120E SCHNEIDER SVC HITACHI CPT GENUINE SONY P HITACHI V7130E SCHNEIDER SVC HITACHI CPT PANASONIC NVG12 SONY R9615/ HITACHI VTISIIE SENTRA HITACHI CPT GENUINE SONY RM650/651/ HITACHI VT220E SENTRA HITACHI CPT PANASONIC NVGI8 SONY RM JVC HR SENTRA HITACHI CPT GENUINE SONY RM662/ JVC HRD SHARP VC9300/ HITACHI CPT PANASONIC NVG21 SONY RM664/ JVC HRD SHARP VC581/ HITACHI CPT GENUINE SONY RM JVC HRD SHARP VC HITACHI CPT PANASONIC NVG40 TASHIKO I JVC HRD SHARP VCA HITACHI CPT GENUINE TASHIKO JVC HRD SOLAVOX HITACHI VT PANASONIC NVG45 TATUNG RG40/ LOGIK VR SONY C5/6/ HITACHI VT GENUINE TATUNG RC LOGIK VR SONY SLC HITACHI VT PANASONIC NVL28 TATUNG RC MA TSUI VX SUSUMI XR HITACHI VT63/ GENUINE TATUNG RC MATSUI VX TASHIKO VVE921/ HITACHI VT120E PHILIPS G11 I,R TEXT _ TELEFUNKEN FBI MATSUI VX735A TASHIKO VVE TT FS9/10 DIGIVISION PHILIPS K73,30 NON TEXT TOP TEL MATSUI VX TASHIKO VVE TT RG PHILIPS K73,30 TEXT TOSHIBA C7995/ MITSUBISHI HS301/ TOSHIBA V55/ TT RG PHILIPS RC TOSHIBA C MITSUBISHI HS303/ TOSHIBA V73/83B TT TX PHILIPS RC5903 GENUINE TOSHIBA V MITSUBISHI HS TOSHIBA V93B TT VS PHILIPS 3A TOSHIBA 1534A/B MITSUBISHI HS TT VS5 TEXT PHILIPS SIMPLE NEC 9034/ VIDEO HEADS ARE OF THE JVC HRD540 GENUINE PHILIPS MINIATURE 9.95 REMOTES SUPPLIED ARE ORION VH BEST QUALITY AND ARE JVC HRD750 GENUINE PHILIPS VR6362/ EITHER "KONIG","CME" OR ORION VH BRANDED OR JVC HRD755 GENUINE PHILIPS VR MANUFACTURERS OWN PANASONIC NV MANUFACTURERS OWN MASPRO SE.E 90/S PHILIPS VR PANASONIC NV *** NEW *** CASSETTE HOUSINGS FERGUSON 3V65/FV11R FERGUSON FV31/FV31R FERGUSON FV37/FV37H HITACHI VT11E HITACHI VT64E PANASONIC NV333/ PANASONIC NV PANASONIC NV SERVICE AIDS ALLEN KEYS (8 METRIC) 4.95 ANTEX 17W IRON ANTEX 25W IRON 8.75 ANTEX IRON STAND 4.95 CIRCLIP KIT 5.95 CLEAR TEST TAPE 7.95 COLCLENE WIPES..95 FIBRE CLEANING PEN 2.95 HEATSINK COMPOUND 1.55 NUT 8 BOLT KIT 2 5MM 2.35 ONYX SOLDER PUMP 9.95 ONYX TIPS 1.50 PERMABOND ADHESIVE 3.95 PORTASOL STD PORTASOL PROFFESSIONAL PORTASOL TIP 3.95 SELF AMALGAMATING TAPE 3.45 SILICON GREASE 1.85 SOLDA MOP 80 SOLDER 0.5KG 18SWG 8.50 SOLDER 0 5KG 22SWG 8.75 SPRING KIT 5.50 SUPER GLUE 1.25 UTILITY KNIFE 1.45 WELLER GUN TIPS ( WATCHMAKERS SCREWDRIVERS 2.95 X1 PROBE KIT X10 PROBE KIT SUNDRIES CTX EHT LEAD GENUINE MATSUI LEVER ASSY 1.85 TX10 FOCUS UNIT POSITOR POSITOR POSITOR 2.95 TUNERS FERGUSON TX90/ PANASONIC TNV87510F2 TC208/1C225/TC2000/TC2024 TC2213/TC2284/7C PHILIPS ELC U U411 (PHONO SKT) U411 (COAX SKT) VIDEO LEADS CAMCORDER COPYING KIT7.95 SCART LEAD FULLY WIRED4.95 SCART SWITCHING KIT SCART LEAD TO 6 PHONO SCART COPYING KIT 5.95 SCARY TO 2 SCART SKT 5.95 SCART TO 5 SCART SKT 6.95 VIDEO COPYING KIT 5.95 VIDEO FLY LEAD 75 VIDEO REPAIR KIT ALBA ALBA FERGUSON 3V FERGUSON 3V29/ FERGUSON 3V31/ FERGUSON 3V35/ FERGUSON 3V44/ FERGUSON 3V64/ FISHER FVH FISHER FVH GOLDSTAR GVH GOODMANS VCR HITACHI VT HITACHI VT HITACHI V711/33E HITACHI VT 20/130E MITSUBISHI HS PANASONIC G DECK 6.50 PANASONIC NV PANASONIC NV PANASONIC NV PANASONIC NV PANASONIC NV PANASONIC NV PANASONIC NV PANASONIC NV PANASONIC NVG10/ PHILIPS VR PHILIPS VR PHILIPS VR SENTRA SOLAVOX SONY C5/ SONY C SHEET AUTOMATIC DOCUMENT FEEDER 10 AUTODIALS FOR EASE OF USE 30 METRE PAPER ROLL. MERCURY BUTTON TO TAKE ADVANTAGE OF CHEAPER TELEPHONE COSTS ' PHOTOCOPY FACILITY SAMSUNG SF SHEET AUTOMATIC DOCUMENT FEEDER AUTOMATIC FAX RECEPTION SIMPLE CONTROL SETTINGS 10 AUTODIALS FOR EASE OF USE ' PHOTOCOPY FACILITY. CANON FAXPHONE ' 10 SHEET AUTOMATIC DOCUMENT FEEDER ' HIGH VOLUME RECEPTION WITH 100 METRE PAPER ROLL. 16 AUTODIALS FOR EASE OF USE AUTOMATIC GUILLOTINE. PHOTOCOPY FACILITY, CANONS DE -CURL FEATURE FOR FLAT FAXES CANON FAX T FULLY PORTABLE ELECTRONIC TYPEWRITER FULL LINE OF CORRECTION MEMORY' WORD DELETION 8 BOLD PRINT ' ABILITY TO CENTRE BETWEEN MARGINS CANON ES ' 14 CHARACTER PER SECOND DAISYWHEEL PRINTING. SPELL CHECK FACILITY 16K TEXT MEMORY. PAPER FEED. BOLD PRINT 8 UNDERLINE FACILITY CHARACTER PITCH. CANON ES K MEMORY ' , PS CHARACTER PITCH 80,000 WORD SPELL VERIFIER. LCD DISPLAY 15 CHARACTERS PER SECOND 131 DIRECTIONAL PRINTING. ' 3.5- MS DOS DISK DRIVE FOR UNLIMITED MEMORY. SHARP PA.W ALL MACHINES ARE COVERED BY 12 MONTHS WARRANTY THESE ARE A SMALL RANGE OF OUR BUSINESS MACHINES THAT WE SELL INC CALCULATORS, COMPUTERS. FAX MACHINES. PHOTOCOPIERS & WORD PROCESSORS. PLEASE RING FOR DETAILS CELLULAR TELEPHONES *** SPECIAL OFFER *** NOKIA WE OFFER A RANGE OF MOBILE PHONES INC MOTOROLA. PANASONIC. NEC,NOKIA. MITSUBISHI 8 TECHNOPHONE. FROM NEW 8 USED HAND PORTABLES TO MOBILES AND TRANSPORTABLES NO LONG TERM CONTRACTS & A RANGE OF BILLING PLANS TO SUITE EVERYBODY PART EXCHANGE 8 RECONNECTIONS ARE WELCOME WE ALSO PURCHASE SECOND HAND EQUIPMENT CE_LULAR SPARES ANTENNAE 3DB BODY MOUNT DB GLASS MOUNT DB PASSIVE REPEATER _ DB PASSIVE REPEATER WAVE ON GLASS /4 WAVE SHARKS FIN MAGNETIC MOUNT 3DB MOTOROLA T/PORT MOTOROLA 8500X 1.4 WAVE MOTOROLA 8500X BUTTON MOTOROLA 8800X MOTOROLA 9800X PANASONIC D SERIES PANASONIC Fl PANASONIC H SERIES PANASONIC I SERIES NEC P NOKIA MITSUBISHI MT MITSUBISHI MT TECHNOPHONE TP2 1,4_22.50 TECHNOPHONE TP TECHNOPHONE TP BATTERIES MITSUBISHI MT MITSUBISHI MT MOTOROLA 4500X MOTOROLA 4800X SLIM MOTOROLA 8500X MOTOROLA 8800X MOTOROLA PERSONAL 1001IMAH MOTOROLA MICROTAC I 1001MAH MOTOROLA MICROTAC II 135OMAH NEC 9A NEC P NEC P4 800MAH NOKIA MAH NOKIA NOKIA PANASONIC D SERIES PANASONIC EH SERIES PANASONIC F 1 70CMAH._26.50 TECHNOPHONE TP2 STD TECHNOPHONE TP2 ti/d TECHNOPHONE TP MAH BATTERY CHARGERS MOTOROLA T PORT MOTOROLA 8000/8800X MOTOROLA MICROTAC NEC P PANASONIC F TECHNOPHONE TP TECHNOPHONE TP BATTERY ELIMINATORS MOTOROLA 8000/8800X _12.50 MOTOROLA MICRO TAC NEC P NEC P NOKIA PANASONIC D SERIES PANASONIC F SERIES P/P CHARGES: COMPONENTS 1.00 PER ORDER UK SERVICE MANUALS 1.25 EACH CELLULAR TELEPHONES 5.00 PER ITEM OFFICE MACHINES 5.00 PER ITEM EXPORT ORDERS PIP CHARGED AT COST WHEN ORDERING:: PLEASE ADD PIP VALUE TO ORDER TOTAL THEN ADD 17.5% VAT TO THIS TOTAL DELIVERY BY RETURN ON ALL STOCK ITEMS *'* MINIMUM ORDER VALUE 5.00 ***

14 TELE SPARES LTD DISTRIBUTORS 250 COLEMAN STREET WHITMORE REANS WOLVERHAMPTON WV6 ORH TEL: :2 FAX: TRANSISTORS 2SC SC SC SC-I923 2SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC C SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC S S SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC C SC SC SC SC SC SC-2228A SC SC C SC SC SC SC SC 2238A SC SC SC SC SC SC SC SC SC 2285A SC S SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC S SC SC SC C SC SC SC SC SC SC SC SC SC SC 2832A SC SC SC SC-2834A SC SC SC SC SC SC SC-2412K SC SC SC C SC SC SC C SC SC SC SC C SC SC SC SC SC SC SC SC C SC SC SC SC-249I SC SC SC SC SC SC SC C SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC C SC SC SC SC SC SC SC SC-2547E SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC C SC SC SC SC SC C SC SC SC SC C SC C SC SC SC SC SC SC SC SC SC SC SC SC SC SC C SC SC SC SC SC C SC SC SC SC SC SC SC SC SC La 2SC C SC SC C , $44 2SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC C SC SC C C SC SC C SC SC SC C SC SC SC C SC SC SC SC SC SC SC SC SC SC C SC SC-3212A SC SC SC SC SC SC C SC SC SC SC SC SC SC SC SC SC SC SC SC SC-3298A SC SC SC SC SC C SC SC SC C SC SC SC SC SC SC C SC SC SC SC SC SC SC SC SC SC C SC SC SC SC SC SC SC SC SC C SC SC SC SC SC SC C SC C SC SC-3502E SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC C SC SC C SC SC C SC SC SC SC SC SC SC SC TV FAULT FINDING BOOK 7.99 VCR FAULT FINDING BOOK 8.99 TV& VCR FAULT FINDING BOOKS SC SC SC SC SC SC SC SC C C SC SC SC SC-3688 SGSSGS SC SC SC SC SC SC-37I C SC SC SC SC C SC S SC SC SC SC SC SC SC C C SC SC SC SC ,56 2SC SC C SC SC SC SC SC SC SC-3851A SC-3852A 2SC SC SC SC SC SC SC SC SC 3885A SC SC 388A SC SC-3892A 375 2SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC C SC SC SC SC SC SC SC SC SC SC SC C SC SC S SC SC SC SC SC C C S C SC SC SC SC SC SC C SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC-4289A C SC SC C SC SC C SC SC S SC SC SC SC SC SC ,11 2SC SC SC SC 460C SC SC SC SC SC SC SC-515A SC SC SC-546A SC SC SC C SC SC SC-642A SC SC SC-680A SC SC SC SC SC C SC SC SC SC SC C SC-805A C S SC SC-867A SC SC C SC SC C -945P SC C SC S SD SD S S S SD SD S SD , S SD-1127K S SD SD SD SD-1163A SD D -1164Z E S , S SD SD D SD SD D E , A P SD-1266R SD S SD-I S SD SD SD SD S D SD SD S SD SD-I S SD SD SD SD SD SD SD SD SD ,06 2SD SD SJ SD " SD J ,54 2SK J -182L SK SK SD SD SK SD SK SK SD ,44 20K SD SD J SK SD SD S2174GR $ SD SD SK SD SD SK SD SD S D SK SD SK SD SK SD K SK SK SD SK SK SD P SK SD SD S SK SD SD 786S SK SD SK-769L S SK SD C SK SK SD-789E SK SD BL SK " SD-235Y '' Y S SK SD-152E S0-795A SK SK SD SD S SD SK-1254L K S SD SK D SK SD S SK SK SD SK SD SD SK-146V SK-974L 969 2SD D -350A SD SK D SD S6-1476L SK SD SK-147GR SK-102GR S SK-147V 089 3SK SD S SK SK-I D SK D SK SD SD SK D SK-170GR SD S SK D -401A SK D SD SK SK SD SD SD SK-192A SK SD SK SD-415 0, SK SD SK SD SK SD K SD / S SD SK ' SK 2, AA SK AA 20 9, SD AC S SD S K AC MD AC SK BA B SK AG AG SK VI 0.10 AC -187K SD SD K AC SD SK-30AGR 0.25 AC -188K SK AC08FSM SD-I SK AC1OFSM SD SD SK AD AD -I SD SK AD S SK AD SD SK AD SD SD AF SD SD AF S AF A AF -I SK AF SO SD AF SD AF SD SD 946B AF SD AF BC SD SD SK BC -107B BC C BC S C SD BC -108B SD C SD SD BC -109A S SD SK BC D SK BC -109C BC SD SK BC SD SK BC SK-416L 1.31 BC SD SK-416S SD-666AC BC SD BC S BC SD SD-668A SK-430L 1.31 BC SD BC C SD BC SD-669AC 0, BC D SD BC SK SD SK BC -148A S2-120L BC -I BC SK BC S S SK SD SK Continued 2S SD SJ SK , 5, next month.. All orders placed before 5.00pm are despatched the same day. Please add 1.00 P+P and 17.5% VAT to total. Access and Visa cards accepted la'ak4:111 Please phone us if the part required is not listed as we have a vast range of stock. All components are brand new. Prices may change without prior notice. Sorry no refunds for returned stock.

15 EDITOR John A. Reddihough PRODUCTION EDITOR Tessa Winford Please note that the telephone numbers below are for contact with the advertisement departments. Editorial enquiries should be sent to the editor at the address given on page 389 or faxed to ADVERTISEMENT MANAGER Carol Nobbs FIELD SALES EXECUTIVE Patrick Irwin SALES EXECUTIVE Pat Bunce Fax ADVERTISING PRODUCTION Brian Chapman Fax PUBLISHING DIRECTOR Susan Downey SUBSCRIPTION ENQUIRIES SUBSCRIPTION HOTLINE 24 -hour subscription ordering with credit card number phone and quote reference INJ. COVER PHOTO This month's cover photograph shows the Ferguson IKC2 chassis - see article on pages 416-9,drAik BUSINESS BUSINESS PUBLISHING 7T_MIEIE Channels Galore One increasingly wonders why so much political effort was put into keeping alive the MAC approach to the development of TV transmission when the digital approach was advancing at such a rate. Philips and Thomson, who have a great deal of influence with the European Commission, had of course invested heavily in MAC - and saw it as a way of halting the advance of Far Eastern consumer electronics manufacturers in the European market. But they've not been idle with respect to digital TV, which has everything going for it - including the prospect of an internationally accepted standard. The aspect of digital TV that has been much in the news of late is the prospect of vastly increasing the number of channels in the bandwidth available through the use of signal compression. BBC and BT engineers demonstrated at the recent ISO/MPEG (the Moving Pictures Expert Group of the International Standards Organisation) meeting in London a video coding system that compresses a standard -definition TV signal to a data rate of 6Mbits/sec rather than 216Mbits/sec. Of particular interest technically is the fact that this system has a `two -layer' capability, providing standard or HDTV pictures in either of two modes, simulcast or compatible. In the former the SDTV and HDTV images are coded independently while in the latter the SDTV signal is used as one prediction option for the HDTV encoder. Digital compression systems reduce the demand on spectrum space by selecting for transmission only the differences between successive fields rather than sending complete fields. The receiver's decoder uses a field store to hold the field, the incoming data being used to update it. Thus digital signal processing enables us to cram more channels into a given bandwidth and/or provide higher -definition pictures. At the recent Financial Times Cable and Satellite conference Celso Azevedo, technical director of Societe Europeenne des Satellites (SES) which runs the Astra system, announced that by building digital capability into its new satellites the Astra system would be able to provide 180 channels in two years' time. This could be doubled to 360 channels by launching a further satellite. The digital compression system to be used squeezes ten standard channels into the space now occupied by one. From the broadcasting viewpoint the economics are interesting. A single -channel transponder at present costs 4m a year to lease. If it carries ten digitally compressed channels the rent per channel could fall proportionally, introducing all sorts of possibilities. It seems however that the main use envisaged - who could provide 180 channels of separate programming? - is as a means of making feature films available to the viewer at a reasonable cost. Six channels could, it was suggested, be devoted to one film, with staggered start times so that the wait for the start of a particular film would not be more than about twenty minutes. Digital compression enables the data rate for digital TV signals to be reduced by a factor of about fifty without any noticeable impairment of picture quality. It can be used for satellite, terrestrial or cable TV channels - and other services of course. Added complexity is required in the receiver, but with modern chip technology this shouldn't translate into any dramatic price increase. If we accept SCS's forecasting, and it has proved to be reliable in the past, this massive increase in the number of channels could be available within two -three years. It is particularly gratifying that the UK continues to play a major role in the development of digital TV. The original impetus for its development came from the need for standards conversion. By early 1973 a field -rate standards converter developed by the IBA was in regular use. DICE (digital intercontinental conversion equipment) as it was known was an outstanding engineering achievement, the fastest computer in the world at the time. By the early Eighties compression techniques that enabled the bandwidth required to be halved had been developed. Along the way came teletext, Nicam and other developments. The UK has all along been in the forefront in digital signal processing. TELEVISION APRIL 1993

16 Importance of Dish Size with Astra Reception Ian Martin Some time back in these pages I wrote about the installation of my own Amstrad SRX200 Astra system and, subsequently, my Philips STU902 BSB system. Like many in the industry, I have since then bolted a lot of satellite dishes to a lot of walls and found several factors that commonly affect system performance. Sparklies The most common complaint with existing installations is of sparklies. This is usually because the signal's carrier - to -noise (C/N) ratio is too low. In most cases the cure is to realign the dish carefully, using a signal -strength meter, and perhaps add a little mechanical skew to the LNB with the voltage -switched type. Sometimes you find that the gain of an LNB or a receiver is lower on one or more channels than the others. In such cases changing a head -end component or using an LNB with a lower noise figure can give improved results. Whilst changing any head -end component, check for ingress of moisture or spiders. Where the cause of the problem is a mismatch in the cable, shortening or even lengthening it can just occasionally help. Unfortunately it's not easy to check on such deficiencies, let alone remedy them, in the limited time available when attending a simple Astra installation - and the problem always becomes worse as time passes or as soon as the installer goes away! Even when all the above points have been checked and corrected it's still possible to have signal problems on a few channels., This is especially so when a 60cm dish is used in a "fringe" area such as Wales, the South West or anywhere north of the M62. The problem is usually experienced first with some of the vertically polarised German mode 2 channels via Astra la - their signal strength becomes weaker as one travels westwards and northwards. It's accentuated when the receiver has a poor threshold and the LNB has a not -so -low noise figure. Wet weather worsens the situation by attenuating the signal from - and sometimes to - the satellite. Dish Size One solution, local planning regulations permitting, could be to use a larger dish. Originally SES, which owns Astra, specified the use of a 60cm dish and an LNB with a noise figure of 1.5dB in the central European area where the signal strength (e.i.r.p.) is 52dBW. Use of a 75cm dish was recommended in the "fringe" areas mentioned above, where the signal strength is 50dBW. Given these conditions it was predicted that CCIR grade 4 (or better) quality reception would be achieved with a clear sky, while acceptable performance would be obtained under 99.9 per cent of weather conditions. This however was a "link -budget" calculation: practical experience has taught us about the effects of bad weather and poor installation. I decided to carry out some checks on dish performance by using various sizes with a standard set-up. All other things being equal, an improvement in delivered signal strength should be obtained as dish diameter is increased. The tests were carried out using an Amstrad SRD400 receiver and three dishes provided by Lenson Heath, each of which was fitted with the same Nothern Telecom LNB/polariser unit. Comparisons were made between 60cm mesh and 80cm solid dishes, some additional measurements being made using Lenson's new 98cm solid dish. Before any practical measurements were carried out, the relative gain of each dish was calculated from its signal -gathering area. This was then compared with the manufacturer's data. Table 1 lists the results of this exercise. Performance Tests Measurements were carried out on each of Astra 1A and 1B's channels, using the 60 and 80cm dishes, to establish the effect on the C/N level of using a larger dish. The results are listed in Table 2. The location was in South Wales and the measurements were made under clear sky conditions. Equipment conditions were as follows: LNB noise figure 1.3dB (quoted), meter receiver threshold 8dB (quoted). Each Astra satellite has four transponder groups. Two use vertical and two horizontal polarisation. The four groups are "aimed" at different points in Continental Europe, i.e. they have different footprints/service areas. SES distinguishes the groups by referring to them as mode 1 horizontal, mode 1 vertical, mode 2 horizontal and mode 2 horizontal. Except for the Movie Channel, the Sky services allocated to the UK use mode 1 with vertical polarisation. Mode 1 is aimed to the west to give a footprint centred on Northern France/SE England. Hence the mode 1 signals should be the strongest ones. Table 2 shows that the Sky channels 4, 8, 12 and 16 produce the highest C/N levels while the German channels 2, 6, 10 and 14 produce the lowest levels. This is largely because of the different group footprints. The D2 -MAC channels 3, 7 and 11 have slightly better C/N ratios than expected, due to the MAC system's resilience to noise degradation. The Astra 1B satellite's transponder groups are not so clearly distinguishable in terms of measured C/N ratios, though again the vertical mode 1 signals are the strongest, particularly Documania via transponder 32. The choice of transponder 23 for UK Gold seems strange, as it produces one of the lowest C/N ratios. Overall these measurements seem typical of systems in this part of the world. In considering the C/N ratio figures given in Table 2 we Table 1: Dish size and relative gain. Dish diameter (cm) 63* Relative gain Maker's quoted gain (db) *Lenson Heath's 60cm nominal diameter dish has an actual mean diameter of 63cm. 402 TELEVISION APRIL 1993

17 Table 2: C/N level measurements. Channel/ group Astra 1A Programme C/N level (db) 60cm dish 80cm dish 1 1H Screensport V RTL H TV V Eurosport H Lifestyle/JSTV V SAT H TV V Sky One H Teleclub V 3 Sat H Filmnet V Sky News H RTL V V Pro H MTV V Sky Movies Plus Astra 1B 17 1H Premier V Movie Channel H ZDF V Sky Sport H DSF V MTV H UK Gold V TCC/JSTV H N V Sky Gold/TV Asia H TV V CNN International H NTV V Cinemania H TV V Documania For measurement conditions see main text. should perhaps mention that for good quality reception a C/N ratio of about 13dB is desirable. Less than 13dB usually means degraded performance in terms of a worse S/N ratio and sparklies. With the equipment used it was not possible to measure accurately below 11dB. Similar results were obtained when the Amstrad receiver was used with an older "blue cap" LNB (noise figure 1.8dB) except that on all channels the measured C/N levels were approximately 1dB lower. Received picture quality was acceptable, though it was sometimes impossible to eliminate sparklies completely with the UK Gold and German channels when using a 60cm dish. Again this is typical of installations in this area. Better results were obtained when the 98cm dish was tested, an improvement of 3dB in the C/N ratio being recorded in comparison with the 60cm dish. This would provide a good increase in the performance margin under adverse weather conditions. Unfortunately this size of dish is not specified for Astra reception, though it could form the basis of a motorised system. This takes us into the realms of planning permission of course. As a separate test, mostly to satisfy my own curiosity, the same checks were made using an older 60cm solid aluminium dish. No measurable performance differences were noted in comparison with the results obtained using the 60cm mesh -type dish. Lenson Heath points out that the gain of a mesh dish should be similar to that of a solid one provided the holes are not too large. Of greater importance apparently is the shape of the holes: poorly designed perforations can trap water and snow, attenuating the signal when the weather turns bad. The choice of a solid or mesh dish is largely a cosmetic one. Conclusions What conclusions can we draw from these tests? It seems that SES's original calculations for the expected signal strength and dish and receiver characteristics were correct. When one gets close to the boundary of the 52dBW footprint however signal degradation increases. Although this boundary defines the area in which the use of a 60cm dish is recommended, better results are obtained using an 80cm dish. This is definitely the case where the customer wishes to receive German programmes without interference. More important perhaps is the improved margin against interference under bad weather conditions provided by a larger dish. Another advantage of a larger dish is its reduced beamwidth, which means that it will be less likely to pick up interference from satellites adjacent to the one with which it is aligned. I have already come across a 60cm Astra system that, because of slightly incorrect azimuth alignment, was receiving signals from the Eutelsat craft at 16 as well. This problem can only worsen with time, as more satellites are placed in orbit and dish alignments move. Acknowledgement My thanks to Lenson Heath for the loan of dishes and the provision of technical data. In a later article I'll describe the installation of a polar mount designed for use with their 80 and 98cm dishes. BACK COPIES We have available a limited stock of the following back issues of Television: 1992 February, April, May, June, July, August, September, October, November, December January, February, March. Copies are available at 2.75 each including postage. Send orders to: Reed Business Publishing, Television Back Issues, Room L323, Quadrant House, The Quadrant, Sutton, Surrey SM2 5AS. Make cheques/postal orders payable to Reed Business Publishing Ltd. TELEVISION APRIL

18 Letters CHEAP WASHERS During the course of my daily round I've noticed an increasing number of self -installed aerial brackets. Although they are fitted well enough the screw holes are too big for most woodscrews and leave little enough landing for Rawl - bolts unless a washer is used. The thing that drew my attention was the number of cases where a two -pence piece with a hole drilled through the centre was being used in place of a washer. This intrigued me so much that I asked the price of a two -pence sized washer at my local hardware shop. The answer? Ten pence each! Now don't get me wrong. I don't think that anyone can expect to buy anything for less than ten pence today, and if you think about it most of our use of the odd penny is because VAT brings the price to XX99 or something similar. But isn't it a sign of the ravages of inflation when five coins of the realm can be used as washers for the price of one of the real thing! I should perhaps add that I think it's against the law to deface British currency. Punishment is probably death by hanging or the rack. I believe it's quite an old law. John Hopkins, The TV Workshop, Felixstowe, Suffolk. BRASS DRIVE BUSH My thanks to W. Wilcock (February) and S.J. Caine (March) for their comments about the Sharp brass drive bush. If only to ensure that I haven't mislead anyone on the subject of the method of fitting I must comment further. In my original note (December 1992) I said that the brass item should be fitted using a hot soldering iron. Clearly this would be no good with the Sharp part. The one to which I was referring has a tapered fit however and is made to be heated for fitting to the shaft. I hope I didn't give the impression that I was actually soldering the thing on. The taper -fit bush is available from VAS Electronics, Gleneagles Avenue, Leicester ( ). Chris Watton, Boston, Lincs. NICADS AND CAMCORNERS I read John Kendall's letter (March) with some sympathy. The problem with the palmcorder is that the layman thinks, when it shuts down, that the 6V battery has been properly discharged. It hasn't. The memory effect will then affect the charge -discharge cycle and in no time at all the battery has become useless for its purpose. It can recover from this effect, with careful treatment, but the layman will have gone off to buy another battery - at some cost! A nicad battery delivers only 1.2V per cell. Thus a battery of five is needed for 6V. Ideally they should be discharged until each cell reaches 0.9V, the end -of -charge voltage for a 6V unit being 4.5V. This is far below the point at which the camcorder shuts down. Possibly cost and size are the reasons for using a 6V battery, but if the end result is such an unsatisfactory charge life surely, as Mr. Kendall suggests, a 7.2V unit with some regulation in the machine would be a better option? Discharging the battery until it is flat is not a good idea. Some cells may reach OV before others. These will then begin to charge in the reverse direction, which makes life even more difficult. I've made a discharger for my 12V nicads. It senses when the terminal voltage has fallen to 9V then shuts off. By doing it this way I've managed to keep in service for over six years the batteries I use. Varta produced a very good guide for nicad users at one time: it might be worth trying to obtain one. Many people comment about the short life of nicads used in radio receivers and personal stereo equipment. These items were designed to be used with zinc -carbon or alkaline batteries whose cell voltage is 1.5V. When a nicad battery with only 1.2V per cell is used the end -point voltage for the load is reached that much sooner! Graeme M. Young, Nottingham. NICAM ON A SHOESTRING I read with interest Keith Wevill's article in the February issue, having myself built a near identical system about ten months ago using components obtained from the same sources. I bypassed the TDA8421 tone control chip with some regret as it has such obvious potential, but I'd no way of obtaining data on the device or the I2C bus system. My solution was simply to take the audio signals from CS56/7 to 10kS2 log. potentiometers and, after removing diodes DS81/2, take the sliders of the potentiometers to RW37/CW28 and RW34/CW25 via 22µF capacitors. The video signal required was obtained from the excellent signals panel used in the Philips G11 chassis. Since this requires some 40V to tune across the bands it fitted well with the 36V the Nicam panel needs. A further advantage of this signals panel is that it has a stand-alone audio demodulator and output section that also operates at 36V. This can be used for initial tuning, or as a separate mono output. I wired up the Gil unit first to ensure that it operated satisfactorily, then carried out modifications to the Nicam panel as described by K. Wevill. The Nicam signal was taken from the video detector to the Nicam panel. In my case a d.c. bias was already present at the panel's video input so no problems were expected and none were found. Since I didn't intend to use the video signal for viewing I deliberately tweaked the vision i.f. to enhance the Nicam signal level. The sound quality is excellent without any additional tone control and fully justifies reports on the system. I.C. Rohsler, Harborne, Birmingham. COWBOYS SHOOT BACK I read with particular interest Ed Rowland's article (February) on cowboys since by his definition I would be one of them though I've had twenty five years experience of repairing TVs and VCRs as well as the design and manufacture of various electronic products. But I'm not a member of any guild. I've moved away from full-time repair work now but do undertake the odd job in any spare time I am lucky enough to have. While the cases mentioned by Ed Rowland are horrific, I can quote quite a number of instances of gross over charging and what amounts almost to fraud by 'respectable' dealers. An acquaintance of mine recently took a six -year old Hitachi VCR to one firm and was told that the trouble was caused by defective heads, which cost 97 plus fitting, and that the machine was therefore a write off. When my acquaintance asked for it back he was told rather aggressively that there was no point and that it would be disposed 404 TELEVISION APRIL1993

19 of for him. He rather stupidly agreed to this. Now you and I know that a set of replacement heads for such a machine can be obtained for between 10 and 20. I wouldn't mind betting that the dealer concerned whacked in such a set and either put the machine out on rental or sold it off. Such cases are not rare in this part of the world. I recently fitted a motor supplied by the customer to a record deck. Total time taken was less than five minutes. The quote from another firm was 45 plus VAT. I'm sure that most dealers are from time to time guilty of making up losses incurred in sorting out the real pig that we've all had occasionally. My point is that there seems to be an increasing trend for certain dealers to do this all the time. The same trend can be observed with other retail businesses. My wife recently took a ring to a well-known firm of High Street jewellers for a small replacement opal to be fitted. The manager quoted we had the job done for 8 by another more honest but much smaller jeweller. Maybe if the repair business cleaned up its act and charged an honest rate for each job, based on the amount of time spent doing it, instead of working out the cost on the "how much can I get from this client" basis, the cowboys would be out of business because the public would learn to trust local dealers. I've just had a set in from someone who lives forty miles away: he simply doesn't like being ripped off the minute he walks through the door of a 'respectable' dealer. L. J. Pitts, B.Sc.(Hons.), FIAP, LRSC, South Brent, Devon. I feel that I must take issue over Ed Rowland's Cowboys article (February). It seems to suggest that anyone who offers a repair service without certain paperwork or qualifications is a crook. A comparatively few bad experiences are cited, leaving the reader to infer that this is the inevitable penalty for not paying the full price asked by those who have the paperwork. Qualified people are not immune from dishonest practices however. Be honest about the fact that many cowboys, almost certainly a majority, are capable of doing just as good a job as those with qualifications. Many of them will honourably admit defeat if they cannot cope. It's natural for those who have undergone formal training to feel hard done by when they find that others can do a lot of their work as a result of informal learning and self-taught skills. One shouldn't deny the right to those members of the public who want, or can only afford, to take a cheaper and often worthwhile risk in getting their servicing done. I know that there are safety issues here, but Ed Rowland didn't specifically mention these. Clearly any servicing involves risks. Electronic work is not alone in this respect, and there will always be a minority of bad cowboys. But this is what free competition and choice is all about. And for heaven's sake don't encourage the Eurocrats to get their ham-fisted fingers on any more of our activities. This would only make life more difficult for us all, including those who feel that they are fully qualified. What's needed is a way of punishing those who behave badly rather than more restrictive practices. Martin J. Loach, Abingdon, Oxon. I'd like to point out that not all cowboys are the small fry, as suggested in Ed Rowland's article (February). About two years ago I was working at a training establishment in Liverpool. Trainees from our and other departments were allowed to bring in TV sets, VCRs etc. to be repaired where possible. The majority of sets were old ones (Philips G8s etc.), many intended for use with little Johnny's computer games. One morning however a three year old set made by a large European manufacturer was brought in. Its owner told us that the local approved dealer, who advertised and sold just this one brand and had sold him the set, had said that the tube was duff. A replacement, with fitting etc., would cost around 150, with a small discount for cash. He could have the latest all singing and dancing model however for a good discount with trade in. There was an argument and the disgruntled set owner withdrew. We were his second opinion. The type of tube involved is renowned for premature failure. Its display was sad to say the least - very dark and muddy. The red appeared to be missing, but on closer observation seemed to be fading in and out cyclically. A check showed that the tube base voltages were all more or less correct. By now most of you will have guessed that the tube was o.k. Disconnecting the degaussing plug and carrying out a manual degauss restored a perfect picture. The degaussing thermistor was the offending item of course and was replaced. The old one sounded like Mick Jagger's maracas. and showed perfectly for our students what the inside off a cooked thermistor capsule looks like. From set switch on to repair completion took about an hour, including discussion of the fault with the trainees initiating the sequence of steps in the fault-finding process. The happy owner bought everyone a pint. His annoyance with the dealer was understandable. Further questioning brought out the information that during his visit to the dealer the set was at no time out of his sight (he was actually taken into the workshop) and that the set was never opened, diagnosis being based on off -air signal reception. How many other basic rules were ignored? How many other people are taken in by these methods? Joe Public expects an accredited dealer to be a little more honest than the Snoddies of this world, but there are nevertheless such obvious rackets. About a week later the set's owner came back to see us. He'd returned to the shop and confronted the engineer, who had a 'manager' badge on his coat. Once again he was offered a discount to buy a new set. He left after telling the 'manager' that he would never shop there again. P. Perkins, Wirral, Merseyside. FIXING GRUNDIGS Excellent technical advice on Grundig products can now be obtained from a very helpful gentleman, Allan Dyson of Tameside Technical Services. He's an ex-grundig TLO whose advice is available to the trade at a very reasonable charge. Our own problem started when a service manual for the VS520 VCR couldn't be obtained from Willow Vale, who told us that they had been trying to obtain it from Grundig for months. I had paid my membership to TI'S: my phone call to Allan Dyson resulted in a tuner/i.f. fault being traced to component level - with a complimentary service manual being thrown in! With Grundig phone lines that are permanently busy, or "we don't give technical advice to non -approved service departments", I can certainly recommend Allan Dyson's service. He can be reached on This is what technical advice should be like. Brian Davidson, Davidson Bros., Greenock, Renfrewshire. TELEVISION APRIL

20 Modern TV Receiver Techniques Part 4 There was a time when TV receiver audio circuits could be dealt with in a few paragraphs. While this is still true with simple, basic TV sets, there have been tremendous changes in audio systems at both ends of the broadcasting chain over the last few years. We'll start with the simplest arrangement and work up from there. Mono FM System The monaural sound signal is transmitted on its own frequency -modulated r.f. carrier, with ±50kHz maximum deviation, at a level 10dB below that of the vision carrier. With system I the sound carrier frequency is spaced 6MHz above the vision carrier: with the European systems B/G the spacing is 5.5MHz above the vision carrier. As before, we'll stick to system I for our examples. The sound carrier beats with the local oscillator in the tuner to produce an i.f. output at 33.5MHz. There are two alternative ways in which this signal can be processed. It can either be filtered out then amplified and demodulated, or passed via the vision i.f. amplifier to the vision demodulator where it will beat with the vision carrier to produce a 6MHz difference signal, with the f.m. intact, which can then be selected, amplified and demodulated. The latter system, called the intercarrier system, has been in use for many years. It has several advantages: tuning errors and drift have no effect on the carrier frequency, which is governed solely by the very accurately maintained vision -sound spacing at the transmitter; the sound carrier benefits from the gain provided by the vision i.f. amplifier; and the sound circuit is simple. Typical Circuit Fig. 1 shows a typical simple TV sound system of this type. The input from the vision demodulator is first passed through a ceramic filter which is resonant at 6MHz, its bandwidth being about 200kHz. This is wide enough to embrace the ±50kHz f.m. sound deviation while rejecting the luminance and chroma signals. In some receivers two ceramic filters are used, connected in series. The sound carrier enters the chip at pin 1, after which it's passed through several stages of amplification with limiting - the limiting clips off any amplitude modulation caused by the vision signal, the a.m. rejection with normal input levels being about 55dB. Eugene Trundle The clipping action produces a squarewave output. As this contains many harmonics of the baseband frequency the signal is next passed through a low-pass filter. This restores the carrier waveshape to something like a sinewave for application to the f.m. demodulator, which is of the quadrature synchronous type. Again, as described last month, the action is based on the sample -and -hold principle. The sampling gate is opened for an instant during each carrier cycle. An unmodulated carrier will be passing through zero when the gate is opened, so there will be no output. As the phase/timing of the signal advances and retreats, the sampling action generates an output that's proportional to the frequency deviation. A reference carrier is required to produce the gating action. This is generated by the high -Q tuned circuit Ll/C5 whose flywheel effect averages the carrier frequency, thus providing a constant -phase reference feed for the demodulator. In current practice a ceramic filter is used for this purpose instead of a discrete LC circuit. Next comes a voltage -controlled amplifier (VCA) whose gain depends on the resistance between pin 6 of the i.c. and chassis. An alternative way of arranging for this volume control action is to apply a variable d.c. control voltage to pin 6, the volume level then being proportional to the applied voltage. Where control is done by sending serial data along a bus line the chip must incorporate a circuit to decode the data and set the gain of an amplifier stage. Back to the simple circuit shown in Fig. 1 however. The Audio Amplifier The demodulated audio signal has to be de-emphasised. An RC network performs this operation, the capacitor being connected to pin 12 of the chip while the resistor is within the chip. The signal is now ready for application to the driver and output stages which in a simple system are generally, as shown here, within the same chip. The output stage usually consists of a push-pull pair of transistors operated under class B conditions, the d.c. mid -point voltage being isolated from the loudspeaker by coupling capacitor C10. The value of the resistors connected to pin 7 of the chip determine, as part of a negative feedback loop, the a.c. gain of the output stage, the capacitors connected to pin 8 setting the amplifier's upper frequency limit. R5 and C12 form a Boucherot cell which suppresses any tendency for h.f. oscil- Input from vision demod 6MHz f 'tier IF amp and limiter -O. LPF FM e mo VCA Driver and output stages 9 C A Ll 5 Cs Vol -1:11-wv- 012 T 406 Fig. 1: Typical intercarrier sound/audio amplifier chip arrangement. TELEVISION APRIL 1993

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22 lation, due to the inductive load (the loudspeaker and its wiring), to occur in the output stage - similar arrangements are used in field output stages. A small chip of the type taken as an example here will provide an audio output power of about 3W average, depending on the supply voltage and the heatsink arrangement used. This type of i.c., or a small power amplifier chip fed from a separate intercarrier sound amplifier/demodulator i.c., easily caters for the needs of a portable set or an economy large -screen receiver using a single loudspeaker. Although for purposes of illustration we've shown a dedicated sound channel chip, in modern sets the intercarrier sound and audio preamplifier stages are likely to be incorporated in a more complex chip that performs many other functions. Stereo Sound There are several possible sources of stereo sound in a TV receiver: a built-in Nicam decoder; external sound -with - picture sources such as a satellite TV receiver, a hi-fi VCR or a Laserdisc player; and, in some countries, a built-in analogue stereo sound decoder. Incorporating a stereo sound system calls for difficult choices by the setmaker in terms of loudspeaker arrangements and operating power. The power drain introduced by a reasonably high-energy stereo audio system may be at least equal to that of the line output stage. With a class B output stage it fluctuates in sympathy with the sound: if a constant -current system is chosen there's little problem with regulation but a lot of heat has to be dissipated. For outputs up to about 5 + 5W a single dual - channel power output chip is generally used; for higher powers there is usually a separate audio output chip in each channel. Since low -frequency sounds are not very directional some sets have a single, centrally -mounted woofer that's fed with the L and R signals and a pair of side -mounted boxes that take L and R feeds respectively and produce just the medium- and high -frequency sounds. Fig. 2 shows such an arrangement, devised by Sony. The centrally -mounted 13cm woofer has separate 70 coils for the L and R audio signals, which are fed to them via low-pass LC filters. The side - boxes each contain a 7.5 x 13cm mid -range unit, a 5cm dome tweeter and a first -order crossover network. In conventional stereo TV sets much ingenuity is used by manufacturers to overcome the acoustic problems associated with small loudspeakers in plastic cabinets. Bang and Olufsen, always aware of sound quality, have in some models used a pair of rear speaker -loading horns inside the TV set's cabinet, sticking up on each side of the c.r.t. No matter how well a TV set's sound system is designed, there's no doubt that taking separate audio feeds from the set - or VCR - to a hi-fi system with widely -spaced loudspeaker enclosures is better for stereo. Spacial Effects Because a stereo receiver has two sound channels with closely -mounted speakers and may well work with a monaural signal for much of the time, several 'ambience' techniques have been devised to enhance the sound. They are also sometimes used in audio equipment. The first of these is the 'stereo -wide' system, which gives the subjective effect of increased L and R sound separation. It's done electrically, by emphasising the difference between the L and R audio signals. The simplest and most common way of doing this is to inject into each audio channel an anti -phase (polarity -reversed) signal from the Tweeter L In n -I Mid-range unit 82 Woofer with two 7.n. coils Fig. 2: 3-D loudspeaker system with a common base unit. R in L in BPF BPF Fig. 3: A stereo -wide arrangement. I. out -ew Frequency. Hz Mono In RW out LW out Fig. 4: Response curves for one form of pseudo -stereo system. Fig. 5: Way of obtaining the response curves shown in Fig. 4. Mono in Supersound on/off 100Hz 0-100* phase -kw phase shift shift Phase shift Network 1 1 khz Effective time delay Fig. 6: Ferguson's Supersound system, in which the signals in the R channel are subjected to a frequency - dependent time delay L R in ID0091 out R out other channel, generally via filters that pass only the mid - and high -frequency components of the audio signals. Fig. 3 shows the arrangement. Thus the greater the difference between the L and R sounds, the greater the differential emphasis. This arrangement is sometimes called spatial sound - the terms are often used indiscriminately. With a monaural sound source and a pair of correctly - phased speakers at each side of the set the sound appears to come from a point between them - the picture tube screen. It's possible to process the monaural signal electrically to TELEVISIONAPRIL 1993

23 , I produce a pseudo- or artificial -stereo effect. While hardly natural, a subjectively pleasing 'projection into space' effect is obtained. One way of achieving this effect is to feed different frequency bands to the two speakers - see Fig. 4. Here a notch filter is used to reduce the mid -range frequencies in the feed to one speaker (left) while the other speaker (right) is fed with the original monaural signal minus the signal fed to the left speaker. Fig. 5 shows how this is done. An alternative way of achieving this sort of effect is shown in Fig. 6. The signal in the left channel is left alone while the signal in the right channel is passed through two frequency -dependent delay networks. Their combined effect is to introduce a 180 phase shift at around 1kHz, increasing to a phase shift of 360 as the frequency rises. This time delay, proportional to frequency, in one channel gives a subjectively 'live' quality to the sound. Before we leave the sound processing section, a word on the bass, treble and balance controls with which most stereo TV sets are fitted. Tone control is carried out by operational amplifiers with frequency -selective RC networks in their feedback paths. The amplifier's gain is set by a d.c. level at at an i.c. pin or a control data decoder within the chip. Typical control curves are shown in Fig. 7. Balance is set by differentially adjusting the gain of two VCAs, one in each channel. Satellite TV Sound MAC TV transmissions use the Nicam/packet sound system we'll examine next month. With most conventional satellite TV transmissions that use f.m. vision modulation, for example the majority of the Astra channels, there are f.m. carriers for the sound, very similar to those used for +10dB -12tP Bass control range lk Hz Treble control range MU] Fig. 7: Typical tone control response curves. terrestrial monaural TV sound. The main difference is that there are more of them! Fig. 8 shows a typical satellite TV channel spectrum, with five sound carriers sitting at 6.5, 7.02, 7.2, 7.38 and 7.56MHz on the h.f. side of the baseband video signal. The main carrier, at +6.5MHz, is used for the monaural sound signal, with a bandwidth of 20Hz-15kHz. Carrier deviation is ±85kHz and the pre -emphasis time - constant.sec. Thus the f.m. signal processing system is exactly the same as that used for terrestrial TV transmissions, already described, save for the operating frequency - in the example just quoted the filter and demodulator are tuned to 6-5MHz. The simplest satellite TV receivers demodulate only the main sound carrier, providing a single audio output at a level of about 0dB (0.775V r.m.s.) for feeding to a TV receiver or VCR. Auxiliary Carriers Rather less deviation (±50kHz) is used with the auxiliary sound carriers, though the audio bandwidth is the same: thus the modulation index is rather lower. 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24 Luminance rch.mr 2 3,/5 Mono sound 6.5 Stereo 7: Auxiliary carriers 774 Radio 146 Fig. 8: Baseband Astra channel spectrum. In addition to the primary and four stereo carriers there may be up to eight further carriers, typically used for radio programmes. The spacing of the four stereo carriers is 180kHz. MHz Baseband input Tuned filter 7.02MHz 7.2MHz 1504 U829B Demod k 5V 1Q 56n 470 sv SV 1V07 470k Part 4053 CX C C 101 qtr 10 C Y BX BY B AX AY A Mute C out B out A ou R out Lout The system has much in common with the companding principle used in hi-fi VCRs and with Dolby noise -reduction techniques. It's implemented by i.c. VCAs whose control voltages are derived from the signal itself via filters. Without noise reduction the signal-to-noise ratio of a narrow -band satellite TV sound channel is about 50dB: the Wegener Panda 1 system provides an improvement of about 18dB, increasing the subjective signal-to-noise ratio towards 70dB, which is very good for an analogue transmission. Table 1 shows the uses to which the auxiliary sound carriers are put, for stereo and multi-lingual sound, with Astra transmissions. Fig. 9 shows the simple multi -channel sound selection system used in one satellite TV receiver, in which each carrier is selected by an LC tuned circuit and fed to its own f.m. demodulator. The four demodulators work all the time, the switching chips IV07 and IS05 selecting the ones required in accordance with the control signals applied to pins 9, 10 and MH MHz big V a-4 Mode Fig. 9: Audio demodulator arrangement used in the Ferguson SRA4 satellite TV receiver. The four channels are identical. a pborer signal-to-noise ratio a noise -reduction system is used - with Astra transmissions the Wegener Panda 1 type is employed. The term Panda is derived from 'processed narrow -deviation audio'. It's a form of adaptive pre - emphasis. The dynamic range of the audio signal is compressed before transmission so that, in relative terms, high-level signals are attenuated and low-level ones are boosted, the amount of compression also being frequency - dependent. The opposite has to be done to the baseband audio signal in the receiver so that its dynamic range is restored. In the process the noise component is suppressed. Sound Carrier Conversion An alternative to using four parallel sets of filters and demodulators is to employ a superhet system to convert the wanted carriers to fixed frequencies that can be handled by a pair of fixed -tuned filters and demodulators. This technique has the advantage of being versatile: it will work with any pair of carrier frequencies, including the piggy -back radio stations (see Fig. 8) that many transponders carry on carrier frequencies between 7.74 and 9MHz, while in sophisticated systems the required channel can be user -programmed per transponder and stored in memory. There are several variations on the sound-superhet technique. A common one is shown in block diagram form in Fig. 10. Two fixed -frequency oscillators run at and 18.08MHz. The output from one or the other is selected and fed to one of the gates of a dual -gate f.e.t. mixer, where it beats with the incoming signal to produce i.f.s at 10.52MHz (R channel) and 10.7MHz (L channel). With the output from the 17.72MHz oscillator in use the R sound comes from the 7.2MHz carrier ( = 10.52MHz) while the L sound comes from the 7.02MHz carrier ( = 10.7MHz). When the system control switches over to select the output from the 18.08MHz oscillator the R and L sound signals come from the 7.56MHz and 7.38MHz carriers respectively. Table 1: Astra sound carrier arrangemen Mode 7.02MHz Language 1 L Language 1 L Lang. 1 mono anguage 1 Language 1 R Lang. 2 mono Language 2 L Lang. 2 mono Lang. 3 mono Language 2 R Lang. 3 mono Lang. 4 mono 410 TELEVISION APRIL 1993

25 18.08MHz tat osc MHz filter Limiter/ demod l OF de- emph. Mode control Baseband input INE1 _ MHz filler Limiter/ demod --0 LPF Add HExpartsion/T de-emph. Switching -F. Mono Fig 10: Superhet sound carrier selection system. The wanted carriers are shifted to and 10-7MHz. Not all receivers have true Wegener Panda 1 expanders: the system is a licensed one and alternatives, which are known as soundalikes, may be used. Outputs to RF mod 0 12V 1 5V 1k 11V Clock pulses IC Data pulses wie 100p ,.L606 18p k 0.1 n GMHz 24p 270p 270p k7 4k7 W r- Left Right la 0-1ep FL601 and FL604 -Wr 10.52MHz filters R out 8 k2 IC601 T BA229-2 L out Baseband 020 FL II 01 TR and FL MH2 filters k Fig. 11: Frequency -synthesis satellite sound tuning system, with effectively continuous coverage over 5-9MHz. The R and L outputs from IC601 in this Tatung design go to a dual Wegener Panda expander chip. Instead of having fixed oscillators it's possible to use a variable or programmable oscillator: adjusting its frequency will tune, rather like a radio receiver, through the band of sound carriers associated with each satellite broadcasting channel. Fig. 11 shows one possible circuit. Tr606 is the local oscillator whose frequency is controlled by IC609 which contains a programmable divider and a 4MHz reference oscillator. These form a frequency -synthesis tuning system which is controlled by the receiver's microcomputer system control chip. The oscillator's output is fed to gate two of mixer transistor Tr602, whose other gate receives the whole spectrum of sound carriers from bandpass filter FL603 - this has a bandwidth of 5-9MHz. The mixer's output contains all the sound carriers, converted to difference frequencies in the range 8-13MHz. Those centred on and 10.7MHz are selected by ceramic filters FL601/4 and FL602/5 respectively and applied to pins 11 and 14 of the dual f.m. demodulator chip IC601. By programming IC601 any pair of sound carriers 180kHz apart (as in Table 1) can be brought into line with TELEVISION APRIL 1993 the filters and demodulators. In this particular design the sound is tunable in 10kHz steps from 5MHz to 9MHz, and any required point can be stored in memory. These tuning/control systems will be described in detail later in this series. The L and R outputs from pins 4 and 5 of IC601 are passed to de -emphasis circuits that can be switched between simple linear (.sec) or Wegener -expander operation. Earlier in this series we looked at the principle of the double-superhet. In the type of satellite receiver we've just considered the sound carriers undergo four frequency changes: in the LNB, at the indoor tuner, at the vision demodulator and at the sound carrier frequency changer. Next Month Having covered analogue TV sound systems, in the next instalment we'll examine digital TV sound broadcasting - the Nicam and MAC/packet systems now used with many terrestrial and satellite TV transmissions. 411

26 VCR Clinic Reports from Eugene Trundle, Nick Beer, Chris Avis, Graham Richards, Brian Storm, Alfred Damp. Chris Watton, Ed Rowland, J.R. Cutts, Michael Dranfield and John Edwards GoldStar GHV12401 This machine produced an unstable E -E picture, with poor sync, white crushing and bright psychedelic colours. The cause, as is usually the case, was the 11.1F a.g.c. reservoir/decoupling capacitor, in this case C715. It was open -circuit. E.T. Akai VS23 This machine has a rather complex power supply, with a mains transformer, chopper circuits and voltage doublers. One of the more obscure faults that arises in this area is partial failure of C6 (220µF, 10V). The symptoms are wavy horizontal bars (like r.f. interference) across the picture and on -screen captions and intermittent colour in the E -E and playback modes. It's worth noting that if the audio/preamplifier PCB behind the drum isn't earthed the syscon shuts the deck down within a few seconds in all modes. Beware of this!e.t. Tatung TVR6111 We do a lot of Tatung servicing and have on several occasions come across the following fault: the reel drive intermittently fails to engage when fast forward or rewind is selected. If you get this symptom, check that lever trigger 260 is free to slide along brake plate 261. If it's stiff, the metal stop for the brake plate (formed from the deck plate) needs to be bent very slightly to the right as you view the underside of the deck from the front. The numbers quoted above are taken from the exploded deck diagram in the service manual. This machine also appears under the Amstrad banner. E.T. JVC HRD150/Ferguson 3V45 The play symbol, a dotted triangle, was lit up the whole time the machine was switched on, whether or not the play mode was engaged. It was caused by leakage between pins 4 and 5 of the fluorescent display PCB. Someone must have managed to spill liquid through the cassette loading slot! Thorough scrubbing with surgical spirit removed the conductive deposit in this very high -impedance circuit. E.T. Sharp VC381 Misalignment is becoming a common problem with older VCRs. Realignment usually provides a lasting cure, making repairs justifiable. This particular example suffered from intermittent playback chroma. When the colour was present there was patterning on it. The cure was to reset the carrier peak adjustment slightly. In the record mode there was no picture because the dark clip was misadjusted. N.B. Granada VHSHX3/Hitachi VT8700 This old timer had been bought for 50 at a sale. There are still plenty of them about! The customer said that it 412 wouldn't play. On test there was no vision in the E -E mode - that's right, there were dry -joints in the i.f. can. It was the first time in years I've had that one. Next the supply guide post was missing, then the loading belt and the spool tyres were duff. After sorting that lot out and setting the machine up I found that it worked very well. An interesting point was that it had a large safety test label on the side from the previous day - presumably all electrical items in the sale had been tested. N.B. Mitsubishi HS330 The complaint with this machine was that the sound would vibrate when the machine had warmed up. Having tested the machine for ages and heard no "vibration" I questioned the customer to fmd out whether she meant wow and flutter, which is not uncommon with this model. Not so. It seemed to be a buzz. So I had a poke around and had success - a buzz appeared on the playback sound. Its cause was traced to a dirty connection between the copper -coloured spring metal that earths the top of the cassette housing and the regulator heatsink. A clean and retension cured the problem. N.B. Ferguson 3V54/55/57 Here's a trap for the unwary, like me. The VCR owner's house mains supply earth leakage trip had operated for some reason. When it was reset, the VCR was stuck in the aux mode. Embarrassment prevents a description of our efforts to restore sanity to the confused microcontroller chip and ourselves until a wiser colleague advised us to press the recessed "ch set" button. C.A. Hinari VXL5 Two non -working, ex -rental machines we'd purchased had the same fault - when play was selected the tape laced, the drum ran very fast then the tape unlaced. The cause of the trouble was that the 6V supply to the drum feedback amplifier IC104 was very low as C145 (100uF, 10V) was shortcircuit. We used a replacement rated at 16V. C.A. Ferguson 3V54/55 We purchased a quantity of 3V54 non -remote control machines for reconditioning as the preferred 3V55 remote control version wasn't available at the time. It surprised us to find that infra -red receivers were fitted, though the machines would respond only to manual operation. When we traced the signal path from the IR receiver's output we came to a link, which had been cut, next to connector CN402 on the small eject -tracking PCB PC1614/1626. When the broken link is replaced the 3V54 becomes a fully remote -controlled 3V55! C.A. Hitachi VT64 Playback was all right but when record was selected the drum and capstan failed to rotate though the record indicator TELEVISION APRIL 1993

27 lit and the tape laced up briefly before unlacing again. We found that the record/play switching voltage double -diode block D626 was open -circuit on the record side. By coincidence we found a similar faulty device recently in the sound section of an older Hitachi machine. In both cases a couple of good old 1N4148 diodes wired in back-to-back proved to be a suitable replacement. C.A. Sentra VX8100HQ/Samsung VI710 For no erase replace transistor Q0501. It's a 2SD261 and no other transistor will work in this position! The cause of its failure is the erase head going open -circuit intermittently because of the plug/socket arrangement. Remove this and solder the lead on directly. How many more types of VCR will need this modification? G.R. Hinari VXL8 The problem, because of mains -borne transients, was no E- E operation, no channel changing, cannot program etc. with just the letter E in the display. Unsolder the back-up capacitor for thirty seconds then reconnect it. Switch on and the microcontroller chip should recover from its crash. We've had this more than once and the routine has worked each time! G.R. Panasonic NVF55 I seem to get more than my fair share of search -tuning faults. This machine would search but wouldn't lock on to stations. Checks on the sync low, a.f.c. defeat and nf.c. feeds showed that there was nothing amiss to and from the demodulator pack, so out came this plug-in pack, revealing a surface -mounted diode (D6701, type MA151WK) with one end missing. A replacement cured the problem. B.S. Ferguson FV31R This machine had a nasty habit of breaking its back -tension arm as the deck mechanics mistimed themselves, no matter how carefully the instructions in the manual were followed. We noticed that when the machine set off in play the drum motor didn't rotate. This turned out to be a vital clue. The drum stood still because the 5V supply to pin 2 of chip IM02 was missing. From a look at the circuit diagram this appears to be totally unrelated. The PCB layout holds the clue: the link that supplies 5V to IM02 also supplies the pull-up resistor RT67 in the mode -sensing circuit, the cause of the trouble being a dry joint on this link. With the dry - joint resoldered and the deck mechanics realigned yet again everything worked correctly. All that was left to do was to fit a new back -tension arm. A.D. GoldStar GHV1248I The E -E pictures were pulling, with ragged edges, more so on some channels than others. Attenuating the input signal (via the aerial lead) established that it was an i.f./a.g.c. type fault - in fact the symptoms were identical to those you get with some CUC series Grundig TV sets. Replacing C715 (1µF, 63V) put matters right. We assume that it provides a.g.c. smoothing but as we don't have the manual we can't be sure. G.R. Alba VCR6000X/Sentra VX8400 As mentioned by Nick Beer in the January Clinic these machines very often suffer from tuning drift. Decoupling capacitors C133/4/5 for the VT line are prone to being leaky. In addition hardwiring the VT line to cure leakage will indeed provide a cure. But the reason for this tuning drift isn't leakage between the print tracks: it's caused by leakage on the component legs themselves! - around C134. The problem is caused by the quantity of glue that's put around the components in this area of the PCB during manufacture (top upper left-hand side with the board hinged up). I suspect that this glue absorbs moisture and then slowly becomes conductive. Thus rather than hardwiring it's easier and quicker to remove this glue and replace C134 (0.1g). The V regulator on this board can also be the reason for tuning drift. G.R. Panasonic NVJ42 Although this machine would accept a cassette it was difficult to get the cassette back and the mechanism spooled backwards and forwards a great deal, rarely performing any function correctly. Checks soon showed that the solenoid which engages the mechanism was operating erratically. Instead of a satisfyingly solid clunk when the operation buttons were pressed only an anaemic click was heard. The solenoid drive system has two parts, a kick and a hold circuit. D603 in the kick section was open -circuit, a replacement restoring normal operation. B.S. Ferguson 3V441JVC HRD140 The drum and the capstan were both running slowly. A check on the servo reference signal, using a frequency counter, showed that it was running at only 2.5MHz. The cure was to replace the 4.433MHz crystal in the chroma circuit. A.D. Matsui VX3000 The complaint was of loss of tuning overnight. On the bench however no channels could be tuned in. R6045 (33k0) was open -circuit. A.D. Akai VS22 The problem with this machine was a bad hum bar on the E- E pictures. We found that C4 (47g, 25V) on the power supply PCB was leaky. A.D. Hitachi VTM722 The E -E audio was low and distorted while playback of a prerecorded tape produced only a cyclic chirping sound. We found that the always 9V supply to IC401 was low at only 4.9V because zener diode ZD854 on the power board was short-circuit. A.D. Toshiba V83 The capstan motor was clearly running too fast. A check on the drive voltage showed that it was high at about 10-11V instead of 6.7V. Checks around the servo chip IC501 showed that although the voltage at pin 14 (capstan a.p.c.) was correct at 3.3V the voltage at pin 15 was only 0.9V instead of 3.3V. Scope checks at pins 19 and 20 (CTL in and out) showed that the control pulses were of correct amplitude though the frequency was of course high because of the excessive tape speed. The tracking input at pin 28 varied the length of the waveform, so all seemed to be correct here. TELEVISION APRIL

28 The next check was on the FG pulses at TP518. The waveform here had gaps in it and varied a little in amplitude. Unfortunately I ignored this, putting the irregularity down to the motor's increased and wowing speed. Wrong decision! So after replacing IC501 and finding that the fault remained as before I had a closer look at the FG pulses. When I dismantled the capstan assembly I found that the coil which forms the stator of the pulse generator was dry - jointed at the point where the enamelled copper wire is connected to the terminal. C.W. Amstrad VCR4600 This machine was dead with the 2A fuse F603 open -circuit. I checked the rectifiers in the main power supply and as they all read o.k. a new fuse was fitted. It blew only a few seconds after switching the machine on again. The cause of the fault turned out to be C836 (3.30, 35V) which is in one of the voltage regulator circuits on the main servo/system control panel. C.W. Logik VR950/Samsung VI611 This machine came to us with the infra -red sensor broken and the loading arms flopping about all over the place. The owner said that she'd tried to remove a jammed cassette and had damaged it in the process. What in fact appeared to have happened was that the nylon gear sector - it's the fan - shaped bit on the loading mechanism - had split where the steel pin is located, allowing the pin to slip out. Hence the looseness of the loading arms. A spot of Superglue was all that was required to repair the infra -red assembly. A new gear sector and pin - they are separate items - had to be ordered from Mastercare. Imagine out surprise when, a few days later, the postman delivered two packages from Mastercare, one a box containing the gear sector, the other a jiffy bag containing the pin! Anyway fitting the parts and removing a thick ring of oxide from the capstan restored normal operation. E.R. Saisho VR1200HQ/Matsui VX820/Hinari VXL35 Failure of Q02, type 2SD1207, is common with these machines. We find that a TIP41C with a heatsink is a reliable replacement. J.R.C. Hitachi VT150 This machine is almost the same as the VT130 but has long play. The problem was a tape stuck inside, no functions and no eject. Whilst checking around we found that the M54649L loading motor and cassette lift motor control chip IC902 was very hot. As both motors ran when powered from a separate d.c. supply we replaced IC902. Unfortunately this made no difference. Voltage checks then showed that the 12V supply at pin 9 was very low at 0.5V. It's worth noting that this chip has two 12V supplies, one at pin 7 for the internal logic and one at pin 9 for the high -current motor drive. Tracing back from pin 9 brought us to the power supply where IC851 had 18V at its input but no 12V output. Although the power supply par41 looks the same as that in the VT130 the regulator chip is different - type STK5476. This is a 12 -pin device with only pins 1-10 used. We didn't have one in stock though we did have the STK5471 as used in the VT130. When we removed the STK5476 we 414 found that the heatsink was drilled with two sets of holes. The smaller 10 -pin STK5471 was quickly fitted to the heatsink, restoring full operation. Could the STK5476 have been fitted because of a shortage of the other type of regulator? M.Dr. Hitachi VT7000 This two-part tuner-timer/vcr came in with the symptoms of a dirty head. Cleaning this appeared to cure the fault but when a recording was made and played back nothing but snow and sound had been recorded. After borrowing a service manual we found that the record 9V supply at pin 8 of the TA4190 chip IC205 was very low at only 1V in the record mode. The source of this supply was traced to a small relay, RL402, on the bottom PCB. There was 9V at the input to this relay but no output. As we couldn't find a relay with the same pin connections amongst our scrap panels we decided to try cleaning the contacts of the old one. We used an Electrolube contact cleaning strip that's specially made for this type of job. It provided a complete cure and after a long soak test the machine was pronounced fit again. M.Dr. Toshiba V71 As a new reel motor failed to restore reel operation we started to make checks in the drive circuit. The conditions at the fast forward and rewind selection pins of the TA7267P motor drive chip IC603 were correct but there was no motor supply at pin 3. Replacing this i.c. cured the problem. For reference purposes note that in the rewind mode pin 7 is at 12V, pin 6 drops from 12V to 5V then returns to 12V, pin 5 changes from zero to 0.7V, pin 4 is the chassis pin, pin 3 changes from zero to to 5V for a couple of seconds then rises to 10V, pin 2 changes from 5V to zero and pin 1 stays at 5V. In the fast forward mode the voltages are the same except that pin 2 remains at 5V and pin 1 changes from 5V to zero. It's not uncommon for the reel motor or IC603 to fail, so the above readings may be of help in deciding which item to blame if you don't have the manual. J.E. Akai VS105 Everything worked correctly except eject, the problem here being that the cassette came out flush with the front panel and couldn't be gripped. All the mechanical functions are set in motion by a motor which drives the main rotary cam beneath the deck via a plastic toothed belt and worm pulley. The carriage up/down lever is driven by a groove in the rotary cam. It was not travelling far enough to push the carriage all the way up, i.e. to eject. When the metal plate that covers the rotary cam was removed we saw that there was a split across half the width of the cam. Replacing the cam and retiming the mechanism cured the problem. Only the eject mode was affected because the other modes used the good portion of the cam. J.E. Ferguson 3V44/JVC HRD140 This machine wouldn't accept a cassette. As the power supply circuit protectors were intact we turned our attention to the carnage assembly. The cassette could be loaded manually, after which all functions such as fast forward, rewind and play worked normally and the cassette was ejected correctly. We found that the cause of the problem was the leaf switch at the right-hand side of the carriage assembly. All was well after fitting a replacement. J.E. TELEVISION APRIL 1993

29 CD Player Casebook Reports from Nick Beer, Mike Leach and Savio Da Costa Toshiba SL55 In the February casebook I mentioned an SM55 that refused to play some discs because the lens was dirty. It seems to be a problem with these machines - I've had others since. Despite the large metal cover over the mechanism the lens gets badly affected by dirt. N.B. JVC XLE300 With consumer electronic equipment becoming ever more complex we all too often overlook the obvious. This was just such a case, and I could have kicked myself for not realising sooner what was happening. The complaint was that the player sometimes wouldn't read a disc, though when it did the results were o.k. On test in the workshop it wouldn't read any discs at all. So we assumed that the laser assembly was faulty and fitted a replacement. As this seemed to cure the problem we set up the machine and left it on a test run. Just for good measure we tried a long -play disc as well. This too was o.k. When the next disc was tried however the machine took an extremely long time to read the TOC - in fact it made several attempts before it played the disc. After taking out the new laser assembly and again checking the mechanics I eventually realised what was going on. When a disc that HELP WANTED Wanted: An e.h.t. transformer for the Tektronix type 545B scope, part no Also an August 1986 copy of Television. W. Larman, Derimar, Horton Road, Stanwell Moor, Middx TW19 6BD. lasted say an hour or more had been played the laser unit returned only very slowly to the beginning to read the next disc, which rotated very slowly. This in fact was the key to the problem. Fitting a new sled motor provided a complete cure. M.L. Akai ACM370L With most discs that were tried init this midi system wouldn't play the first one or two tracks. The outer tracks played all right. As the machine always read the TOC we decided that the laser unit was o.k. After some soulsearching we resolved the problem: the PLL coil was marginally out of adjustment and wouldn't lock up at the beginning of the disc. Slight adjustment of the coil was all that was necessary. Sharp DX650 This American (110V) machine came on when a new mains transformer from RS Components had been fitted to adjust for the different mains supply voltage. But when a disc was inserted CD showed in the display. The sled motor had seized -a drop of oil on the bearings freed it. After that the machine worked well. S.DaC. VTR. Terry Martini, 6 Levant House, Mile End Road, London El 4RB Wanted: Any Philips LaserVision discs (CLV or CAV) or any CD -Video (single or extended play) discs. B. Willis, 50 Sarum Crescent, Wokingham, Berks RG11 1XF Can anyone supply the correct circuit for the light gun that's used with the Binatone 01/4907 video game? Roger Burchett, 12 Ormonde Road, Hythe, Kent CT21 6DN Wanted: Circuit diagram or service manual for the LCM Electronics Ltd. telephone answering machine type P148F. F.C. Hughesdon, 19 Lower Road, Higher Denham, Uxbridge, Middx UB9 SEA Can anyone supply an AUX-box for the Luxor Model 6615 TV receiver, also a service manual? R. Burgess, 82 Bressey Grove, London E18 2HX Can anyone supply details of the modification to convert a Philips BSB receiver, Model STU902, for PAL reception? Peter Clarke, 28 Wentworth Gate, Linton Park, Wetherby, W. Yorks LS22 4XD Can anyone supply a battery or batteries for the Sony Model SLF1UB portable VCR - they are 12V types? R. Buckley, 25 Clarence Place, Morice Town, Plymouth PL2 1SF Wanted: Manuals for the following equipment - Sony V01810 U-Matic VTR; Teac reel-to-reel X1000M; Sharp VC9300H VCR; Sony AV3420CE portable reel-to-reel Does anyone have a collection of Television from the first issue (April 1950) to 1977? Would be going to a very good home! Also maybe Practical Wireless from the first issue to Michael Dranfield, Dranfield and Harrop Colour TV - Video, 62 Fairfield Road, Buxton, Derbyshire SK17 7DW day, home. Wanted: Service information for the Lloyds LVC3000 VCR, made by NEC. S. Burns, 1 Harewood Drive, Ilford, Essex IG5 OPJ Wanted: LOPT for the Waltham Model Also a TDA1104, TDA1106 or MB1106 i.c. B. Battams, 23 Dudley Drive, South Ruislip, Middx HA4 6QN Wanted: Mains transformer for the JVC Model 7170GB and a LOPT for the Panasonic TC381GR. I.E. Finch, 6 Avon Court, Avondale Road, Luton LU1 1DT Wanted: Circuit diagram for the Bush Arena Model BC6130A (Rank Z718G chassis). Photocopy would do. D. Maciver, 46 Newhaven Main Street, Newhaven, Edinburgh EH6 4TD Can anyone supply service and operating manuals for the Houston Instruments EDMP-56E plotter? Stephen Shaw, PO Box 1404, Randfontein 1760 S. Africa. TELEVISION APRIL

30 Inside the Ferguson IKC2 Chassis J. LeJeune It's some four years now since Ferguson started to use Thomson -designed TV chassis. We are becoming familiar with a certain family likeness between them, as was the case with the 'old' Ferguson -designed chassis. The IKC2 is obviously a descendant of the ICC5 with which it bears many similarities, including the infamous though quite reliable thyristor field output stage. So what's new? For one thing there's a totally different discrete -component chopper power supply. This is partly due to the use of a different colour decoder chip, type TA8659CN, which also incorporates the sync circuitry and the field and line timebase generators - you will recall that in the ICC5 a TEA2029C chip produced the line, field and chopper drive waveforms. Other features of the TA8659CN include automatic switching between PAL/SECAM/NTSC operation and a sharpness control circuit. The chassis is used in models with 41 and 51cm tubes. Unfortunately the audio section is nothing to rave over and has given rise to some customer complaints - in early versions of Model 41P3 the audio is definitely odd! This article explains the new features incorporated in the IKC2 chassis, notably the power supply, and aims to help with fault finding, covering some common failures and how to deal with complaints about audio performance. The Power Supply Fig. 1 shows the power supply circuit used in the IKC2 chassis. It's a conventional chopper arrangement, but has three modes of operation - start-up, standby and full power. The chopper transformer LP36 provides mains isolation, and feedback from the secondary to the primary side of the circuit is also transformer -coupled (LP42), just as in the ICC5. At switch -on the power supply operates in its start-up mode. Transistors TP09 and TP12 form a relaxation oscillator that produces a sawtooth waveform at a frequency of approximately 15kHz. The ramp is generated by CP09 which charges via RPO9 and RP03. DP13 clamps the waveform to chassis potential. It's then fed to the base of amplifier transistor TP13. To get the oscillator running, a start-up voltage is provided by half -wave rectification from the mains supply - one side of the bridge rectifier provides the rectification, the feed being via RP36. RPO6 provides a feed for the amplifier and driver stages. Once the chopper circuit gets going and the secondary supply voltages are established the start-up oscillator is disabled by the crowbar circuit consisting of TP02/3 and the associated components. It senses the rise in the voltage produced by the rectifier circuit DP30/CP30. When the voltage at the junction of potential divider RP02/7 is sufficient to turn on DP20, the crowbar transistors TP02/3 latch on, removing the supply to the start-up oscillator. TP02 and TP03 are also used in the standby mode, when they operate in a slightly different manner. Because the line output stage is inoperative in this mode, the drain on the power supply is very light. As 'there are no line pulses to drive the regulation system, the power supply runs in a kind of self -oscillating condition. What happens is that the startup oscillator delivers 'bursts' of 15kHz drive. When the voltage developed across CP30 rises sufficiently, TP02/3 416 shut down the oscillator. The whole power supply then stops and the voltage across CP30 falls. Thus the oscillator can run again. This `squegging' action provides a rudimentary level of regulation on the primary side of the chopper transformer, maintaining the voltage levels sufficiently for the standby condition. To switch the set to full power operation a remote control command produces a low output at pin 20 of the microcomputer control chip IRO1 (see Fig. 2). TR16 and TR17 then switch on, raising the PO (Power On) line to 15V. This brings the TA8659CN chip IVO1 into operation and the line drive appears. The control action is at pin 40 of IVO1 - it rises to 9V in the on condition. The line output stage now starts to work and pulses from pin 9 of the output transformer are integrated to produce a sawtooth waveform at the base of transistor TP54, which drives TP13 via TP69 and LP42. TP13 receives negative -going pulses that cut it off. Now for the regulating action in the chopper circuit. Transistor TP53 acts as a comparator. Its emitter is held at a constant 5.6V by the action of zener diode DP55 and diode DP54 - the combination of a zener diode and a silicon diode provides the correct temperature coefficient. TP53's base senses the h.t. voltage via the potential divider RP51/PP52/RP52, PP52 being used to set the h.t. voltage. Thus the voltage at the collector of TP53 and the emitter of TP54 varies as the h.t. voltage varies. This sets the point during the sawtooth waveform at the base of TP54 at which this transistor switches on. TP54 is in fact acting as a pulsewidth modulator. Note that the h.t. is set at different levels for different tubes. In Model 41P3 the h.t. should be 107V; in Model A51F it should be 111V with an Hitachi tube and 113V with a Philips/Videocolour tube. As TP54's on time varies, so the conduction period of the chopper transistor TP29 alters to stabilise the output voltages. The base of transistor TP13 is forward biased via RP13. Negative -going, width -modulated pulses are fed to its base via DP17 and DP16 to switch it off. When TP13 is on, TP16 is off and TP17 is on - these are the chopper driver transistors. When TP13 is switched off TP16 conducts and TP17 switches off. Current via CP24 then drives the chopper transistor TP29 into conduction. The voltage across CP24 is limited to 2-1V by the combined junction voltages of the three diodes DP24/26/27. When 'TP13 switches on again TP17 conducts, discharging CP24 and cutting off TP29. The longer TP29's period of conduction, the greater the amount of energy stored in the core of the chopper transformer and the higher the voltages developed by the rectifier diodes when TP29 switches off to release this energy. TP18 and TP19 form an excess -current trip. Excess current is sensed across resistors RP32 and RP34 which are in series with the chopper transistor. When TP18/19 latch on, the drive to TP16/17 is removed. The supply to the startup oscillator is also removed because DP08/9 conduct. There is auto -reset at a rate determined by the time -constant of CP18 and RP26. The Line 77mebase Apart from the fact that, as in the ICC5 chassis, the output transformer has a load winding for the field output TELEVISION APRIL 1993

31 Degaussing circuit DP x n7 * 1N4148 ee Ferrite bead Non -isolated DP / isktated 900p HT 150 1k 4n7 1n5 RPO6 12k 120k 120k DPS RP k CP51,=, 5 2' 100 1k 10k 0.1 RP FP AT TP03 BC558C 68k TP02 8C548C RPO3 27k RP09 100k. TP09 BC557C 56k P DP08 1k5 DP09 IDP 18* Z-nnGv1 1k DP19 10k 82k OP10 75 VT 120k TP16 BC CP24 CP P24 DP26 DP 3 s 1N4001 TP DP30 8A157 DP28 8A p 2n =,CP28 ms100 TP AF 470p 0P63 BYW72 C1POVOT 330p BPS k32 FP02 DP65 6I0rn OP66 8A k DP61 BA157 DP62 BA157 7V TP53 8C 5580 * S2206 PS4 30V -VA 15V Line frequency sawtooth 0 Mains suppt k TP12 BC 547C RP26 3k3 TP111 RP18 1k macp18 330p 100 RP P IC CP TP54 8C k 22k 2k Br DP57* inon -isolated chassis Isolated chassis DP16* 01 DP17* Of L'42 4n7 6k8 1k8 TP69 BC54i8C O Stop power line.1 4k7 10M re171 Fig. 1: The chopper power supply circuit used in the IKC2 chassis. stage the line timebase is conventional. The line drive waveform is produced by the TA8659CN chip IVOI. It emerges at pin 39 and is applied to the base of the S2055AF line output transistor TL19 via a straightforward driver stage whose main components are TL17 (BSR50) and transformer LL19. There's no active raster -correction circuitry and no width control. Coil LL26 provides linearity adjustment. sensed via zener diode DV02 and the 13V supply via zener diode DV08. Excessive beam current (a negative -going voltage at the anode of DVO2) switches TVOI on. Excessive voltage on the 13V line switches TV02 on, in turn switching on TVOI. In either event the PO line, at some 15V, is linked to the SP line which, in addition to forward biasing DL16, acts on the regulator in the chopper circuit via DP57 (see Safety Circuit An unusual feature of the timebase section of the chassis is the safety circuit, see Fig. 3, which monitors the field output stage current, the beam -current limiter voltage and the line output stage derived 13V supply. RF24 (see Fig. 4) monitors the current flowing in the field scan coils. An excess will switch on transistor TV12, putting 13V on the SP (Stop Power) line. Diode DL16 switches on while DL17 is biased off, removing the line drive. Beam current is CV02 RVO2 8 k2 13V 1k8 DV08 13V Power on tine DV k k TV02 BC548C 47n V02 20V Beam current sensing 13V DV TV01 C5513C TV12 BF k k DV03 100k Field scan current sensing (junction PF20/241 Stop power Line drive OL17 DL16 3k Line driver stage 4k7 foo OV on 5V = standby Fig. 2: The switch -on control circuit Fig. 3: The safety circuit. Some sets use a simplified arrangement with just two transistors: TV01 is then used for field overload prctection and the beam current limiting is omitted (all sets have conventional beam current limiting via the contrast control circuit). TELEVISION APRIL

32 Fig. 1). This removes the line drive to TP54 with the result that the power supply operates in the standby mode. Note that TV02 (type BC548C) is incorrectly shown as a pnp device in the circuit diagrams in the service manuals. The Field 77mebase The field timebase has unusual features throughout. Fig. 4 shows the circuit. Although the TA8659CN chip IV01 produces a field drive waveform at pin 31 this is used for sync purposes only. The field sawtooth waveform is generated across CF06, which is linked to the 180V line via the two 1.5%2 resistors RF01/02. The ramp is negative -going however, CF06 being linearly discharged during the forward scan period via the pnp transistor TF08 which is driven at its base by the feedback capacitor CF02. NOV s field drive output is fed to the base of transistor TF25 which produces negative -going pulses at its collector to synchronise TF08. The negative -going field ramp is fed to the non -inverting input (pin 3) of operational amplifier IFOla. This is half of a TL082 dual junction f.e.t. operational -amplifier chip. The height control PF11 is part of the negative feedback network connected to IFOla's inverting input (pin 2). The second operational amplifier IFOlb is used as a pulse -width modulator. IFOI a produces a negative -going output ramp at pin 1. This is applied to the non -inverting input of IF01 b (pin 5). IFOlb's inverting input (pin 6) is fed with a line -frequency sawtooth waveform (produced from integrated line flyback pulses). Pin 7 (output) of IF01 b goes high whenever the voltage at pin 6 exceeds that at pin 5. The result at pin 7 is a series of line -frequency pulses whose width increases as the field ramp progresses - this is illustrated in Fig. 5. During teletext operation an additional 25Hz signal is applied to pin 6. This destroys the interlacing to remove vertical jitter. The width -modulated line -frequency pulses are applied to the gate of the field output thyristor TF16 to switch it on. The field scan coils are connected in series with RF24/20/23, the winding between pins 5 and 6 of the line output transformer, and TF16/DF16 between the 13V supply and chassis. During the field flyback the thyristor is not triggered and DF16 rectifies the line -frequency pulses picked up by the winding on the transformer, charging CF25 to about 80V. This produces a voltage difference of about 65V across the scan coils, sufficient to produce a rapid flyback. When the thyristor is triggered on at the start of the field scan the pulse is of short duration. TF16 switches off when the next line pulse is produced by the transformer. Thus TF16 is on for only a brief period. It's switched on progressively earlier during each line, remaining on for a longer time. As a result the voltage across CF25 is reduced linearly to approximately 3V at the end of the field scan. This integrating action produces a linear field scan current. Signal Processing Colour decoding, sync processing and generation of timebase drive waveforms are carried out by the TA8659CN chip IVOI, a Toshiba device with 64 pins. Though designed for multi -standard operation, UK sets are sold as PAL -I only models. Thus many of the pins are not used, being left open - circuit or returned to chassis via resistors. It has two crystal oscillators, one working at 4.43MHz for the colour decoding and the other at 503kHz (approximately 32 times line frequency) in the line sync phase -locked loop. Direct rather than count -down sync is used for the field drive in order to cater for non-standard signals. The RGB output stages, of the class AB type, are on the c.r.t. base panel which has red and green gain and cut-off controls for grey -scale setting. Tuner/IF Section The tuner and the i.f. circuitry are contained within a screened compartment, their separate modules being soldered into the main PCB. The tuner is a Thomson MTP- I-2011, which has a dual -gate MOSFET r.f. amplifier stage with reverse bias a.g.c. It incorporates the PLL tuning control system. An LA7550 chip (IS10) amplifies and demodulates the sound and vision signals. It incorporates a d.c. volume control system. I.F. bandpass filtering is provided by a single -ended input SAWF. Audio Output A TDA2030A chip provides the audio output. It's operated with 30V and -30V supplies. The circuitry is simple and easily understood, but the peculiar audio quality provided by some Model 41P3 receivers requires a bit of explanation. Early production sets have a 240 speaker at the side of the cabinet. There's space for a similar unit at the opposite side, and one of the same type can be installed, wired in parallel with the existing speaker. An immediate improvement in sound quality will be noted. The sound is louder of course. Any worries about the TDA2030A overheating because of the doubled load current appear to be unfounded. Louder sound can also be obtained by reducing the value of RA07 in the feedback circuit from 5.61S1 to 3.9k52, as in Model A51F. This increases the power available to around 5W. The plastic moulded cabinets tend to rattle at high volume. Ferguson has available a small kit of damping pads to stop this - it's quite effective. Model A51F is the main suffered from this malady. The Microcomputer Control Chip Control of the receiver's functions is the responsibility of the TMP47C634N FERG 01 microcomputer chip IRO1. These include on -screen displays, keyboard scanning and front panel display matrixing, the analogue controls and power on -off. Most of the operations are straightforward but the power control port, pin 20, is a useful one to know. Fig. 2 showed the circuitry and we've already seen that pin 20 goes low for power on, switching TR16 and TR17 on - TRI6 is another transistor that's shown as a pnp instead of an npn device in the official circuit diagrams. There's a short delay in the application of drive to the line timebase as CV02 in the safety circuit (Fig. 3) has to charge. This prevents any wildly incorrect -frequency drive being applied to the line output stage, with the possibility of damage. Teletext and Externals Models 41P3 and A51 F are fitted with a scart interface and Fastext PCB. Demodulated video output signals are available at pin 19 of the scart socket while pin 20 accepts an analogue video input. In Model A51F front -panel Cinch connectors are paralleled with the scart socket. RGB input signals can be fed to the scan socket, after which they pass to a CD4066B switching chip that sends either external or teletext RGB signals to the display circuits. The two -chip Fastext decoder is controlled by IRO1 via an I2C bus. The scart/text modules vary between the 41P3 and the A5 1 F, but only in minor details. Both have an on -board 5V regulator whose input is obtained from the chopper's 7V 418 TELEVISION APRIL 1993

33 13V RF24 10 RF NAN- 180V RF01 1M5 IF01 Safety circuit TLD rv7, 3 k k RF2 4.7 Opt OF17 eld scan coils CF25 Winding on LOPT 5 CF02 1 I.n7 10k RFO2 1M5 CF06 470n 1k2 TF08 PF11 BC5513B 4k7 Height 2 1F01a 2k 22k 22k 6 33k IF01b DF15 TF16 EI4M470G2 470 Winding on line driver transformer 6 Field pulses 270 VvV 1k5 25Hz waveform se I,,.35155B Field drive 242 TF25 BC V PEG< 274 6k8 4k7 1k 261,7 Vert shift 10 Sawtooth line waveform DF04 6V k 52 71, Fig. 4: The field timebase circuit. output but requires, in addition, the presence of the line output stage derived 13V supply (V5) to enable it. A switch - on delay is included in the regulator circuit to prevent operation during the power -up sequence. The scart interface handles composite PAL input and output signals, stereo audio input and output signals (there's only a mono output stage however) and RGB inputs. Pin 8 is for AV switching and pin 16 for RGB switching. Servicing While the chassis has a good reliability record the fact that it's tightly packed with components can cause difficulty when fault tracing and repairs have to be carried out. The copper side of the PCB is marked with the positions of the major components. This helps with location, but the circuit diagram is confusing in that lines which join don't always have a dot while use in a few places of the Continental habit of lumping wires into a 'loom' has infiltrated into publications that were once famed for their clarity and well thought-out design. Because of its low fault rate the chassis is not a familiar one to most engineers. This has made it, rather unfairly, unpopular. Since many faults can cause the power supply to shut down it's possible to test the latter on its own in the standby po31i Inputs to 1F01b Putse-width modulated output Field ramp Line -frequency pulses Fig. 5: Operation of the pulse -width modulator (IFG1b). mode. Running it at full power is not possible because this requires line pulses to drive the regulation system. To test the power supply on its own in the standby mode, disconnect pin 20 of IROI. Note that in the standby mode the voltage outputs obtained from the power supply wall be approximately 25 per cent low and not in their correct ratios. Faults in the IKC2 chassis are generally confined to the line output stage and the power supply, as you'd expect. A common complaint with early production sets was of tripping off at high beam currents. This was remedied by a string of modifications. Whilst these cure the trouble they are not easy to implement in the ordinary dealer's service workshop. For the brave however here are the details: Change TL19's heatsink to a new type, part no Connect an 8.252, 10% IOW resistor and a 2,700pF, 20% 100V capacitor in parallel and mount them on the new heatsink using the clip assembly that comes with it. These components replace jumper wire J138 in the h.t. feed to the line output transformer, so remove the link and connect the RC combination in its place via flying leads. Change RP18 to I ko, 5%; C54 to 220nF, 63V; RP55 to 220k12, 5% 0.16W; and RP26 to 3.31S1, 5% 0.25W. Add a 22k0, 5% 0.25W resistor (RP50) between the base and emitter of TP54. If tripping still occurs, the value of RP26 may be further reduced as follows: to 1.8kf2 with 14in. sets, 1.5kS2 with 15-17in. sets or 1.2ki2 with 20in. sets. DP28 going short-circuit will prevent the power supply working because the chopper driver stage has no supply -a clue is that RPO6 will be quite hot. The 180V rectifier DL 11 going short-circuit and its associated resistor RL11 open - circuit will affect the pulse feed from the line output transformer to the power supply with the result that the set trips. Finally, take care when desoldering components in this chassis: good -quality desoldering wick should be used. TELEVISION APRIL

34 A Day at the Thick End Chris Watton It was a cold, rainy dismal Monday morning. As I entered the shop at around 9.20 a.m. to start the week with the usual zest and vigour I saw a strange figure, an unshaven man with unruly hair, dirty shoes and a solemn look. It was fearsome at this time of the morning, but as the haze of cigarette smoke cleared and the view through my bloodshot eyes came into focus I realised that some oaf had left a mirror facing the shop door when we closed on Saturday. Turmoil The day was uneventful until Then all hell broke loose and the phone, which I'm sure is connected to the shop's door bell since one doesn't go without the other, didn't stop until lunchtime. We're the only TV shop in a village about ten miles from the nearest town and I'm sure all our customers think that if it's got a plug, a length of wire or some batteries we must be able to repair it or, worse, tell them how to use it. The recent bout of electric fence generators proves the point. Must be the time for the sheep to eat all the bits that we don't when the cabbage harvest is over. Every Monday starts the same way for us. First we sort out the jobs we forgot to do on Saturday, then we start on the repairs where loan sets have been put out. Some Easy Ones The first of these was simple, a 22in. manual control Philips K30 that was tripping. It still tripped after the tripler had been unhooked. Oh no, please don't be difficult this early in the morning. After a quick check on the line output transistor I started to smile again - it read about 2k0 between its emitter and collector. A new BU208 and a quick look for reasons why the old one should have failed soon revealed some dry -joints in this area, one on the flyback tuning capacitor. I'm sure that this was the cause of the transistor failure. Anyway the set was now working and displaying a good picture. So we put it on the soak test rack and lifted the next one on to the bench. This was a Samsung CI1541ZG with a line across the screen. The field output stage in this chassis receives its supply from the line output stage. But not on this occasion as the 1.5S/ safety feed resistor R412 had failed. Replacement cured the fault and the set was left to run for the rest of the day to prove that no other fault had caused R412's death. The Leslie Speaker System After the first cup of tea and with two easy jobs under my belt I was ready for anything. I let myself in for a real treat, a Leslie speaker system. Now for those of you who haven't had the pleasure of acquaintance with this magnificent job here is what it is. An immense cabinet made from one -inch thick veneered plywood, measuring some 4ft 6in. by 3ft by 2ft and weighing about as much as a Philips G6 (remember those?), houses a 15in. woofer, two mid -range speakers and a tweeter, not forgetting the US -made solid-state amplifier in the bottom. There are also two motors that drive a rotating baffle for the woofer, and a pair of horns into which the tweeter is directed. In principle these rotating devices make the sound come and go. Questionable I think, but the owner assures me that this is what makes an organ sound like an organ. The problem was that the mains fuse kept blowing. Its cause was in the power supply where four huge diodes form a bridge rectifier for the amplifier. Two of them were short-circuit. A Satellite TV Job Now for a very important job. The boss had been complaining about the spotty picture his satellite TV system produced. My recent visit proved that the dish alignment was o.k., so the LNB was condemned. Right again. Four jobs in a row. This can't last! The new LNB was fitted in record time and a check on all channels produced perfect results. Incidentally although the satellite TV system is an Amstrad SRX200 the LNB I fitted was a new type called Continental. It's a smaller unit and has screws rather than rivets to hold it together. The F connection is at the bottom instead of the face side. It produced much better quality than the standard unit, with much less background noise - and is about ten quid cheaper. A Tripping Sony TV The last job before lunch was an 18in. Sony set that tripped. I don't know much about these sets but some basic fault-finding procedures soon put me on the right road. As with all sets that are tripping we first have to find out whether the fault is in the power supply or elsewhere. The way I do this with most sets is to identify the output from the power supply to the line output stage, disconnect this and use a 60W bulb to replace the load. If the tripping stops, the h.t. voltage can be checked. If this is correct the cause of the fault is likely to be somewhere in the line output stage. Back to the Sony set. I followed my own advice and the tripping stopped. As the h.t. was about right at 118V I assumed that the power supply was o.k. So I removed the bulb and for some reason the idea that there must be a short-circuit in the line output stage was in my head. After much checking of diodes and capacitors it occurred to me that the line output stage was perhaps open -circuit rather than short-circuit. To test this theory I again disconnected the power supply and ran it with a lamp as the load. It worked. Then I disconnected the lamp and the power supply started to trip. I reconnected the power supply and put my lamp on the case connection of the line output device, a gate -controlled switch (GCS). The power supply now worked. This seemed to make fault finding much easier. I came to the conclusion that there was no line drive. As the bench was a bit piled up and the scope wasn't to hand I had another brainwave. If I put the meter on to its frequency counter range and checked for line drive I should get a reading of around 15kHz. So I checked at the gate of the GCS and found that there was a 15kHz signal here. It was time to check the GCS, which was open -circuit. Well, all this had led me somewhat astray but maybe next time I'll remember that the power 420 TELEVISION APRIL 1993

35 supply won't run with an open -circuit load. And once again praise to the man who invented light bulbs. After Lunch Back from a healthy lunch - two cream buns, a bag of chips and a tin of pop followed by a very dry cigar - I now felt awful. But the first job that faced me was a set with which I'm more familiar than the one that preceded the refuelling session. It was a Finlux 9510 that was dead. My attention was drawn to the blackened d.c. fuse, so I checked the chopper transistor which was short-circuit. Experience has shown that when this device has failed the 270k0 resistor Ru 17 will be open -circuit. Replacing these two items brought the set back to life but there was no sync. Transistor Tbl on the video output panel is the video inverter for the sync feed. It was open -circuit. Incidentally if you've not come across these sets before don't try to open the tuning flap - there isn't one. Many of these sets are marked around the on/off switch where people have tried to open the trim to adjust the set. It's all done via the remote control unit. Things were really going well. I always start to worry when it's like this, knowing that some pitfall awaits. Would it be the Toshiba 140R4B that was next in line? It ran all right for long enough to make a cuppa and talk to colleagues about the state of the world. We soon put all the major unrest and catastrophes to rights. Then the Toshiba began to burp, producing a display that looked like a wineglass Time for the pitfall I bet. When I removed the back the set ran for half a minute, burped a bit then ran again. Strange, I thought. Maybe a power supply fault of some sort. Time for some tapping on the panel. This made the funny noise come and go. There was a dry -joint on the line output transformer. This just shows that when you think it's going to be difficult it's easy, but when you think it's easy stop thinking. VCRs With about two hours to go to tea time I really had to set about some of the VCRs that were piling up. I mused over the job cards and picked an old favourite, an Hitachi VT11E. The job card said "won't rewind, chews tapes and stops whilst playing". Great! I popped in a dummy cassette and set it going. Sure enough the reel torque was poor, and the loading belts squealed as the arms reached the end of their travel. So I removed the case and opened the bottom panel, then connected the machine to a monitor and checked the recording and playback to make sure that the heads were o.k. They were, so the strip -down started. I do this in two halves with these machines, as with most others. First the top: the head drum discharge brush, the pinch roller, the back -tension band, the reel idler and both reel discs, not forgetting where the height shims and washers etc. come from. I also remove the capstan oil seal at this time. With all these bits laid out, cleaning can commence. The reel shafts and the slant poles, tape guides and lower cylinder are all cleaned with alcohol. The reel discs are cleaned with methylated spirit, both inside the spindle holes and on the drive surfaces. Part two is to tip the machine upside down then remove the capstan securing plate (two screws), take off the belts then remove the capstan - that's why I took off the oil seal before. Almost certainly the capstan shaft will be all brown and sticky. Finally the clutch/drive unit is removed (again two screws). Now there are bits everywhere. My next step is to clean out the capstan bushes. Two pipe cleaners twisted together fit nicely. Soak them in meths and pull them through a few times. This removes all sorts of muck. When the bushes are clean I insert a cotton bud, with only one end on it, from the tape side of the deck which is now nearest the bench. Push it in just far enough so that it won't fall out then run some oil into the bushes from the open end (God this is confusing!). It will have time to work its way into the bushes while other work is being carried out. I feel that it's essential to service the capstan shaft in this way as I'm sure that heavy running greatly contributes to capstan motor failure. At about 45 trade these items should be looked after. I also put a drop of oil on the bearing at the other end of the capstan motor itself, using a thin blade to get it under the drive pulley. Make sure that any surplus is removed before reassembly. At this point the drive pulley must be cleaned. The old belt gunge that sticks like glue can be taken off using an ink rubber or a fibre pencil. Finally the clutch unit can be completely stripped, taking care to note the positions of all the securing split washers and which way round the various wheels should be. Clean all the surfaces with meths - not the felt in the clutch of course - then very lightly oil the three spindles. When the clutch unit is reassembled with a replacement belt it should run like new. The grooves in the drive end of the clutch can be cleaned easily when out of the unit, but don't be tempted to roughen the surface in an effort to improve the traction to the idler - it won't work. A toothbrush and meths or a fibre pencil are excellent for this purpose. Reassembly should be easy - remember to wipe away any oil that may get on to the belts or reel drive components. Remove the cotton bud from the capstan bearing and start to put it all back together. First the clutch, then the capstan which is now very shiny, watching out for the drop of oil that will come from the bushes when the capstan is pushed home. Then fit the two new belts and the capstan securing plate. The last part to sort out here is the loading motor drive belts. One screw and take off one belt. Unplug the connector and the motor is out. Check whether the bearing of the intermediate drive pulley is dry, also the motor bearing - lubrication may be needed. Replace both belts, then refit the motor and connector. All is now finished at this end and the unit can now be turned the right way up. Put the reel discs back on, with a tiny spot of oil on the spindles. Fit a new belt between the take-up disc and the dummy counter pulley. Replace the back -tension band and fit a new pinch roller. Dean the static discharge brush and refit it. Lastly, wipe the capstan shaft and replace the oil seal. With no more bits left on the bench and all the moving parts and the tape guides, heads and lower cylinder gleaming like new pins it's time to try the machine. The result? Perfection, as always. Well sometimes. Final Chores So much for all the good times I've had today. Now to start ringing customers with estimates and ordering spares. Colleagues have put job cards into my tray, requesting spares and asking me to ring Mr. and Mrs. So-and-so to tell them that their TV set is really too old to mend. As you know, not all of them take this too well. Some think that you're a robber while others think that a relative has just passed away. But on with the chores that only the dog's body gets left with. Well, the customers have all been contacted, now for some fun. The recently purchased viewdata terminal awaits. Part numbers found, autodial on and away we go. Why does my terminal always say "?" - because the last time I used COPS I didn't press Q to leave the system, that's why. Sony Willow Vale. Other orders are faxed. Now we eagerly await the parts... TELEVISION APRIL

36 Long-distance Television Roger Bunney January was one of the quietest months ever for DX -TV reception. At the present stage of the solar cycle F2 layer propagation is virtually non-existent. What little SpE reception was noted is recorded below. Very early in January and again early in February there was an improvement in tropospheric conditions, with associated high pressure and fog. Even meteor scatter propagation has been very poor. So to the brief SpE log: 5/1/93 DR (Denmark) ch. E2; +1P7T (Switzerland) E2. 8/1/93 NRK (Norway) E3; TVE (Spain) E2. 16/1/93 SVT (Sweden) E2, 3; CIS (Russia) RI; TVE E3. 17/1/93 TVE E2, 3. 23/1/93 DR E3; NRK E2. 24/1/93 TVE E2. 30/1/93 +PTT E2; TVE E2. 31/1/93 TVE E2. lain Menzies (Aberdeen) reports two auroral events, a small one on the 5th and a more sustained evening one on the 25th. My thanks to lain, Simon Hamer (Powys), David Oliver (Birmingham), David Glenday (Arbroath), Tim Anderson (St Leonards), Roger Fussell (Torpoint) and Peter Schubert (Rainham) for sending in reception reports. 50MHz Experiment An interesting experiment in the 50MHz band is being carried out by two Californian amateurs. In the early hours of February 6-7th the moon was centred between Western Europe and the US West Coast, presenting an ideally placed reflector for aerials at the two locations. Signals were transmitted for two hours each day, on even minutes, the aim being to reflect signals from the States to Europe via the moon. Amateur station W6JKV fed 1-5kW to a 16 x 6 element aerial stack (20.5dBd gain) at 50.03MHz. Station K6QXY fed similar power to a 4 x 11 element aerial (18.5dBd gain) at MHz. With the aerials aimed at the horizon an additional 3-6dB of ground gain was obtained. I hope to be able to report on the results in due course. News Items UK: Following the failure of the country -wide Channel 5 franchise allocation the ITC is considering a more localised system based on larger towns and cities. A consultative paper will be published in the summer. ITV network programming could be distributed in digital form from 1994 onwards, with NTL operating the service. In its January 1993 bulletin the UK Six Metre Group summarises the current situation with 50MHz amateur operators throughout Europe. With the possible exception of Portugal (no information available) there are now operators in all European countries. Output powers range from 3W up to 500W (Denmark): restrictions vary from country to country depending on other Band I services, in particular TV transmitters. CIS: The Lithuanian OK1 relay over the LTV2 network has ended - a full-time LTV2 service is planned. It seems that the Swedish Kinnevik broadcaster (TV2/TV1000) may use the LTV2 system for a commercial service. A new OKI transmitter is in operation at Kaliningrad, on ch. R4 with 5kW. Belgium: Canal Plus is now being transmitted from Leglise on chs. El 1 and E63. It's a 24 -hour service. Finland: The MTV service has now moved to the third network and hopes to achieve country -wide coverage within months. An interesting English -language f.m./tv/satellite bulletin called FM -TV Busybody, aimed at DXers throughout Europe, is being published by FMBB, Box 7, SF , Hyvinkaa, Finland, from whom sample copies can be obtained. The 1993 subscription rate, for nine issues, is 110 FIM. Turkey: Up to ten commercial TV stations are now transmitting, either on test or with programmes. The latest programme provider is Flash TV. Greece: The authorities are about to award commercial broadcasting licences. There have been almost ninety applicants, some of which are already transmitting! Hellas 62, Sky TV, Channel Seven X, Kanali 29, Nea Teleorasis, Left: A convenient station identification, the Duna TV field blanking pulse insert, received via Eutelsat ll F3 at 16'E. Centre: SpE reception of RTT (Tunisia) ch. E4 at St. Leonards, East Sussex by Tim Anderson. Right: Multipath ch. E2 reception of a Koran reading from IRIB (Iran) in early 1992 by Ryn Muntjewerff in The Netherlands - classic F2 reception. 422 TELEVISION APRIL 1993

37 Antenna TV and Mega Channel are all in operation and hope for national network status. State broadcaster ERT is maintaining its three services. India: The Metro Channel has been given permission to operate, initially in the four main population areas (Madras, Delhi, Bombay and Calcutta). Satellite TV Good news for sat -zappers: the EBU programme exchange network has moved from the vintage Eutelsat I F5 at 21.5 E to the modern Eutelsat II F4 at 7 E, with four transponders in use daily at much higher powers than previously. You will notice that the pictures, because of the use of sound-in-syncs, are unsteady. One method of picture stabilisation is to strip off the incoming sync pulses and insert locally -generated ones phased with the picture to obtain correct lock. At present sync inserter units do not appear to be available commercially, though PDS offered a video sync processor that did just this in the early days of satellite TV. If anyone has one of the latter units lying about unused, please let me know! Eutelsat I F2 at 3 E was fired up in late January with an uplink from an Austrian station: signals were seen for three days then ceased. The EBU's French -based (Lyon) Euronews service started on January 1st, providing up to twenty hours of news material daily with sound subcarriers for various languages. Check at GHz (vertical) from Eutelsat II F1 (13 E). An Italian news service called Elefante TV is due to start at any time. Staring this spring Marco Polo 2, now at 0.8 W and renamed Thor after being sold to Norwegian Telecom, will carrying CNNI and Filmnet programming. Children's and sports channels will be added later in the year. Both CNNI and Filmnet will us Eurocrypt S, CNNI with D -MAC and Filmnet with D2 -MAC. Keep a lookout at , , and GHz. Screensport has now been combined with Eurosport and may adopt scrambling. A French -language version, TV Sport, is to be transmitted via the Telecom 2 satellite. Red Hot Dutch, the scrambled hard porn channel that's been in the news recently, may adopt an addressable rotating line encryption standard instead of the present inverted video plus 100kHz sinewave. A further two German -based hard porn channels are promised by early summer. A UK version of the American Nickelodeon children's channel is due to be started by BSkyB this autumn via Astra 1C. A new identification to watch out for is VTM - Vlaamse Televisie Maatschappij NV. This is a Belgian satellite news gathering operator that uses analogue or digitally compressed video plus voice, data or fax transmissions. Hispasat, the Iberian satellite at 30 or 31 W (depending on which publication you read), is now in operation with various encrypted services at high levels plus the German Tele 5 channel dubbed into Spanish. Glum faces in Australia over the loss of the Optus B2 satellite due to a launch malfunction. A replacement won't be ready until mid Optus B1 is now carrying some of the services previously carried by the elderly Aussat A2 satellite, with Aussat A3 taking over the others. The Thaicom 1 satellite, due for launch in November, will go into orbit at 101 E, carrying twelve C band transponders. It will provide a rival service to Star TV via AsiaSat 1. The Hindi -language ZEE TV service via AsiaSat 1 intends to start 24 -hour operation by mid -summer and hopes to be able WE'RE 14 THIS MONTH! Aerial Techniques celebrates it's 14th year of successful trading with several special offers to customers' both old and new. AR300XL Aerial Rotator complete with control consul AR1202 Rotator Alignment/Support Bearing for greater loads Tnax MTH13 High Gain 13 element W/B Band 3 Aerial Yoko 7' screen black & while multi -system tv, covers Bands 1 & 3 and UHF, for use in UK, Europe & Fiance, 12v DC & mains SATELLITE DXERs motorised package, comprises Echostar SR -50 manually tuned receiver, 90cm spun aluminium Dish, 0.9dB LNB, feedhom, polariser, actuator and indoor positioner (1.2m Dish option available) (All prices are inclusive of Vat, Carriage & Insurance delivery 6.50 on large items) Serving the TV and Satellite trade, the retail and enthusiast sector, we have been providing an expert and knowledgeable sales with a free consultancy service for over 14 years. We sell both the usual and often requested, together with the unusual and rarely asked for, if we've not got it then if it's made wewill obtain it. Terrestrial or Satellite - we're there. Our CATALOGUE at 1 samples some but not all that we can supply, send for your copy today. UK & overseas despatch normally ex stock within 24 hours, we'll accept the usual credit cards, cash, cheques. POs - as convenient. Ring daytime with your query or late on our 24 hr 'phone or send In your fax and we'll get back to you shortly. 11 Kent Road. ParLstone, Poole, Dorset lal12 2E8 "I'd: Fax: to use AsiaSat's northern beam to give coverage over the whole of Asia and the Middle East. BBC World Service TV is now being transmitted terrestrially by the South African M Net service, which uses scrambling. Apparently it's possible to view BBC WSTV for free by subtle manipulation of the M Net decoder - one newspaper published details of the knob programming required. According to Pat Hawker, writing in the February issue of Radio Communication, LNBs have been producing interference in the h.f. bands. The source of the interference was tracked down by an amateur using an OptoElectronics 2300 spectrum analyser. It seems that the problem is being caused by high-level operation of the local oscillator in many Ku band LNBs, which are not covered by EMC guidelines. It's possible that interference of this type could occur in Band I. Market Place The third edition of European Scrambling Systems - Circuits, Tactics and Techniques by John McCormac has just been published. Also known as the "black book", it's a goldmine of information on the principles and practice of encryption, including how the various systems were defeated and how you can do this yourself! There are full details of each encryption standard, including Videocrypt. As the book is aimed at European readers in general Filmnet, RTL-4, Canal Plus-RAI and so on are all covered in detail. I found the "dirty tricks" section particularly interesting. A concluding section mentions that the Eurocrypt smart card "is based on the Bull CP8 masked programmed TELEVISION APRIL

38 ECONOMIC DEVICES 32 TEMPLE STREET, WOLVERHAMPTON, WV2 4AN 1C C 15MOH IA CD / M us CD M M OA IDA DI IA IA M MAI BC IN /7 TA CR / CV I2E M 131 1A UI BC159 IA CX E IA ? BC A124E & 531 STA341M IA C1845 IA BC BR 101 IN DTA144Ef M 10* OA ER LS III U S I M005 IA EN ( Ull T.1.422c IA ) 1.34 K TA QM IA ON IA / IA 0317 U ON Ill * US / US IA ? /3 OA IA C BC /5008 IA / E M $ ? M K 184 OA I12 S ? C C Ul C A 0( US ON U/1 BC eunez ( IN / T BIWA ( OA 11533A / IA BD M2955 MI S11( ' OA OA * BC UI U E TDA M BC214 IA , IA E $ TDIDA2A255(306A IA A E ,426E QM IC BD E340 IA / OA E 124 k116k IA U M M IA ST / AC STK IA /7 K IA S0( H T OA 11P M M1435VX * E W S11( E U BU I4550 U CP SC U KA ( M CP % BC E us 4( BIRO 111 K OA W51.93 IA EILIIIAC W31110 IA 011( TBA120S A I ( BC307 IA IN ( ,21 TILA120T ) W ( IA A 0( AF IN M A BC308 IN KM , /5 OA M BC3084 OA IN * W UPC N BF 179 NE555/4 BUT I 1 S11( M BUT' IA 6.15 NE592 S SA UTC E US 4( /7 UPC SPECIAL OFFERS - ENDS 30/04/93 OR WHILE STOCKS LAST TDA 2600 x 2 TDA 4601D x 2 BUT 11AF x 5 BU 208A x 5 BU 508A x 5 CO AXIAL AERIAL PLUG x 25 'F CONNECTOR (SCREW 1 YPE) x TDA 3654 x TBA 120S x IDA 4601 x STK 5481 x TDA 3562A x VIDEO FAULT FINDING GUIDE T V FAULT FINDING GUIDE KBLO8 800V 2A BRIDGE. R X OM /5 BC BUT] 24 U M I Ul N BC BF [ ( ( U / IA / ( BC BFI CP A BC BF/ BUSM1A 2/ / X ( S M BC RAW I UPC _ / B0546 U IA BIOS R3297 OA U2 N K E ZSA IA ( 5.35 BC R B N BY A TBAW UPC I 363C LIT / /4 BY] 33 1* N 517, A IA BC547C 1.10 BF256LC 1.40 BY ST TCA270S BA I BC548 ON BF IA UPC IA E IN H U BY RMI IC IIM % AF 1.11 STR Y IA BAI % M T BC556 LA BF III U % BF SMION T K BF BY BY (* S1R UPC C LI 1 6E BY228 OA / D M IN / A 115 TD ' UI OA 19013V E 4/ U6 BF UI I / X / BC / BY /4 01* MA ) D E458 LA BY SM V 61I T X BC % ID/44600F ZSD I BASH BF BY BOW I * BE /2 108I ) BC640 OA / , BAV BC T BM Ul ? TA P I I I / % / E LX BC E /7 MI M P S BF WIC Y ZSCI E762 1/1 89X M OA 1D I OA BC D BF E : L CA E N I E COCCI 1.14 ' / I98I % / ' ( OA / BC BD I E E E ? EN 1E SC 1398 OA $ BD I E C P E ' I TA E SD BC140 11/ E ? 1/ E BC US CO M TA1227P 212 I E Ill BFR90 Lil W T IDA) IF YOU DONTSEE IT LISTED ASK FOR QUOTE GIVE MAKE MODEL LOCATION REMEMBER TO ADD E100 POST& HANDLING U K MAINLAND ONLY HANDLING CHARGE TO All EXPORT ORDERS AT COST ADD 17 VAT TO TOTAL 424 TELEVISION APRIL 1993

39 M%WA all USE YOUR ACCESS OR VISA 13 TEL (24 HOURS) AIWA Ni alb Head M b kale M BA Re/boner. Sr BA Capstan Mob Band Red Table Rod are CD. Una AV -77 deo Id Rd Roar Bd141 Idler Replecenal Set MAO lid de Capstan Id dun NA CR UM Ifeko Heel BA Roles Bits do IA de REM idlef R Raba In a In Unkeang Rabin CALad Bid Dun dor Came Lana lemon 3rd Red 114 lake Up Rude Tyre ALBA Video Head Pad Rola BrM da tr) dad Band ANISMAD C Valeo Head Nal Mar Clod Coat Hold 0.4ch Caudle Yoko Head Find Rola Bits 1 Dutch Dud Goad* Caudle ill SANG 1 OLUFSEN odes Head Ad Rd Belts MARDI Ida Arm Mid Rd Laden dor Can IlD LUCCA dolled Poch Rob Bets Red dr Tale Up CIAO tare Up Ida Brad Pad Pad Valor Capstan lbw load Mob Cassette Lab lens. 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40 card. It appears that this card has now been pumped or stripped. Card Tricks of Switzerland will market alternative microcontroller cards from January. The conflict has moved into a new phase". This comprehensive book sells at 32 plus 2.50 UK postage. The 1993/94 World Satellite Almanac by Mark Long is available at 69 plus 2.50 UK postage. It's the reference work for all that's happening in the satellite world, but of course things keep changing. So Mark Long's The World Satellite Annual has been published as an official supplement at 41 plus 2.50 UK postage. Truly excellent as these books are, the cost is perhaps rather high for those not professionally engaged in satellite telecommunications. Frank Baylin has broken through the price barrier with the 1993 World Satellite Yearly. It provides a comprehensive reference work at a much lower cost, including data on all satellites at present in orbit or soon to arrive there, with detailed coverage of transmission techniques, encryption, digital compression/hdtv, satellite installation/reception problems and calculations, footprints etc. The book has 440 A4 format pages and is available at 38 plus 2.50 UK postage. Retail orders for the above books should be sent to Swift Television Publications, 17 Pittsfield, Cricklade, Swindon, Wilts SN6 6AN - telephone number J. Vincent Technical Books, 24 River Gardens, Purley, Reading RG8 8BX ( ) is the official wholesale distributor in the UK. Tim Anderson is marketing two computer discs in either Amiga or IBM PC compatible 3.5in. form. The first, called DXWATCH, contains two programs, DXWATCH and IDWATCH. DXWATCH itself is a database of worldwide Band I TV offsets plus small files with Band III and u.h.f. offsets. The program allows you to create your own files so that you could, for example, create files for each channel, each continent or whatever you like. IDWATCH is intended to help with picture source identification by referring to key words. As we all know test patterns are rare nowadays, so that signal identification is an increasing problem. This program contains station identifications and words that often occur on pictures, such as news and weather - the entries for The Netherlands for example include PTT NED, NOS, NOZEMA, Nieuws, Pauze etc. Users can add to these entries, building up a comprehensive database. This disc costs 8 including UK postage. The second disc, AMISCAN Version 2.0, is a database for anyone interested in frequencies above 25MHz - scanner users for example. There are well over a thousand entries that can be searched, sorted, listed, edited and printed. Each entry contains frequency, channel number, mode, service, location, comments etc. Entries can be added or expanded for updating. Information on the disc includes worldwide 10m f.m. repeaters, many of the low v.h.f. signals heard during F2 and SpE openings, amateur radio beacons, European air -band frequencies, many TV offsets and much more. Cost is 7.50 including UK postage. These discs can be ordered from Tim Anderson at 2 Burry Road, St. Leonards-on-Sea, East Sussex TN37 6QX. I found them easy to use and if I can cope anyone should be able to! TEST CASE 364 The workshop never seems to run at full bore in late winter. Thus anyone who brings in a repair at this time of the year is likely to get very quick service from our team of highlytrained technical sleuths. On this bright and chilly morning they were engaged on such mundane tasks as filing service manuals and carrying out repairs to stock machines. Service Manager was casting a jaundiced eye over last month's accounts - gloomy reading indeed. A car drew up in the yard. Its driver picked up a VCR from the passenger's seat and brought it into reception. As soon as it was booked in we had it hooked up on the bench and running. But not running very fast: the cassette loading operation was painfully slow, the cassette just about making it into the machine and down on to the spool turntables. Time to get the service manual out. The machine was an Hitachi VT430. In this deck the front -loading operation is powered by the capstan motor which drives it, along with the tape reels, via a belt and a conglomeration of plastic cogs and pinions. So the first step was to replace the belt. This didn't have the slightest effect on the cassette loading and unloading operations, which where still performed very slowly. Real Technician, who had won the fight for the machine when it came it, decided to see how the capstan motor coped with its other tasks. Before doing so he discovered that tape lacing took place at normal speed - it's done by the loading motor, quite separately from the capstan department - while the drum quickly ran up to 1,500 r.p.m. So none of the other motors on the deck were afflicted. Back to the capstan. at an uneven speed. As a result the reproduced sound was slurred and had a heavy wow. In the search modes the tape moved hardly any faster than the normal play speed. Sometimes, when cue or review was selected, it would come to a complete standstill and the deck would then shut down. Similarly if pause was selected during play or record and then released the capstan would often fail to restart, the result again being deck shutdown. Fast forward and rewind were sluggish, with every sign that a three-hour cassette would take ten to fifteen minutes to transfer all the tape from one spool to the other. Well, that seemed to be enough evidence, the finger of suspicion pointing at the capstan drive system. Real Technician again removed the reel -drive belt, then checked for any tightness in the reel -drive department, here called the clutch base assembly. Everything ran freely, and the reel brakes were seen to be coming off all right. What a pity that, with the belt still off, another similar test wasn't carried out! With the drive belt back in place the machine was once more set to play while further tests were made. RT first had a look at the capstan motor's supply voltage. The A 1 6V line was at almost 19V, but a look at the circuit diagram showed that it comes from an unstabilised 18V supply, so that was o.k. The 5V line was correct. The drive circuitry could have been in trouble but RT next found, the machine having run for fifteen minutes or so now, that the capstan motor's rotor and the on -board drive chip IC1601 were running quite hot. This was the clincher. He decided to replace the motor assembly. Was this a wise move, and would it have cured the trouble? Give some thought to this before turning to page 442 to discover the answers! 426 TELEVISION APRIL 1993

41 Repairing LED Clock Radios Part 2 In Part 1 last month we dealt with the clock and display sections. For space reasons Table 1 was held over and is included this. time. It shows the control and supply pin connections for common clock chips. Now to the radio side of things. Quick identification of the stages of an unfamiliar radio can be difficult. There's a colour code for the small coils used in radios of Far Eastern origin however and this can be a helpful guide to circuit layout. Details are as follows: Circuit Oscillator First i.f. Second/third i.f. Fourth i.f. Detector A.M. Red White White Black V.H.F. Orange Green Pink Blue The tuned section of an m.w./l.w. ferrite rod aerial is colour coded plain/blue or black, the coupling coil green/red. VHF Radios As you would expect these days, single -chip radios are the norm. The only exception is the v.h.f. front end, which is basically the same as that used in other transistor designs. The chips are standard types, but the pin connections vary from one chip to another. Sometimes a separate audio chip is used. Fig. 7 shows a typical v.h.f. radio section up to the audio output point. Q1 is an earthed -base r.f. amplifier which is followed by a self -oscillating mixer stage, Q2, which is again used in the earthed -base mode. The voltages shown are typical. Weak reception is most likely to be caused by transistor Q1 being dead or dying. A quick test is to touch Q2's emitter lead with the end of a short length of wire used as an aerial. If this results in a louder signal than when Q1's Ian Rees emitter is similarly touched, replace Q 1. Short-wave reception but no v.h.f. signals when the same wire is touched on Q2's collector lead suggests that this transistor may be faulty. Dry -joints on L2, L3 and L4 are common because they are pulled about at the factory when being set. The enamelled wire adds to the difficulty of soldering the leads, which are easily broken loose by movement. Note the wax mess in this area, used to dampen microphony and hold components in place. Small movement of components in the oscillator circuit will result in a large amount of detuning and should thus be avoided. As elsewhere the ceramic capacitors used to decouple various points are never above suspicion. Loss of any supply should lead to checks on the relevant ones. Next in line are the relevant electrolytics. The LM1868 chip in the circuit shown receives its supply at pin 19. A decoupled 4V output is provided at pin 16 - this is an unusual arrangement that's difficult to spot without a circuit diagram. The demodulated audio output appears at pin 17. AM Section Fig. 8 shows the first couple of stages of a typical a.m. radio section. Once again a completely dead front end can be caused by failure of Q I, but remember that leakage in the 20nF base coupling capacitor will upset the biasing. Open - circuit coupling windings will be the result if the rod aerial is able to move. Litz wire becomes very brittle when solder is allowed to run up from its joints. If a winding is open - circuit, check farther back towards the coil: it's often possible to use a short fly -lead to remake the connection. The value of the 5,000pF feedback capacitor in the emitter circuit sometimes has to be increased to lonf or more to maintain oscillation in the l.w. band. This component can also cause low sensitivity - another cause of this is disconnection of the unmarked lead from the aerial rod's tuned winding to the gang. The practice of decoupling to the positive side of the supply instead of to chassis can mislead if not expected. If Q1 9016F 0.7V 3.6V Q2 0.7V 9016F 3.7V Part LM1868N L AM osc coil Fig. 7: Typical v.h.f. radio receiver circuitry. TELEVISION APRIL

42 Table 1: Pin connections for common clock chips., IC Hours Set Mins Set Alarm Sett Alarm Set 2 Snooze Snooze Alarm Out Set Off Alarm Out 50Hz In Vss Vdd TMS TMS TMS TMS TMS LM LM * LM MM MM *With the LM8363 pin 27 is alarm 1 off, pin 29 alarm 2 off. TMS1941/1944/1951/1952 common collector; TMS3450/LM8560 duplex type. LM8361/MM5387/MM5402 require separate oscillator. LM8363 X2 alarm. the 2011F capacitor that decoples the emitter of Q2 is leaky the supply will be connected across the 330i1 emitter resistor, giving the impression that Q2 is short-circuit. There will be no output from this stage if the transistor's base bias decoupling capacitors are faulty - the 20nF ceramic connected to the positive rail and the 10µF electrolytic connected to chassis. The unmarked capacitor that tunes the i.f. transformer's primary winding is within the screening can. Check this at the transformer's pins before removing the can. The very act of removing the can may clear the fault if there are dry -jointed connections here. Instability is once again usually caused by a faulty ceramic decoupling capacitor. Failure of individual i.f. transistors is not uncommon. Check the operating conditions after replacement. Fig. 9 brings us up-to-date with an a.m. circuit in i.c. form. The LM1868 is typical of a host of other chips that provide both a.m. and f.m. reception. As with the clock chip, it gives very little trouble. Don't consider replacing it until all other possibilities have been exhausted. If there's no a.m. reception connect a scope to pin 8 to check whether the local oscillator is running. Turning the gang will confirm that tuning is taking place. A sinewave at around 70mV peak -to -peak should be expected here. No l.w. or m.w. oscillation is often due to a faulty oscillator coil. Loss of l.w. only is most likely to be caused by a short in trimmer CT4 or the 120pF capacitor in parallel with it. If the oscillator is o.k. try touching pin 7. This should produce a lot of noise but probably no stations. Leakage in the 20nF capacitor that couples the input to this pin will stop reception. The wavechange switches are often not very good and may bridge internally as the contacts wipe backwards and forwards. Repair is possible if they are opened carefully but replacement is better. Note that the switch bodies may be used as links for the PCB print. If they are loose, whole sections of circuit can be affected. I add wire links to avoid this type of problem. Tuning If you do a lot of radio work you'll probably have made yourself a wand to check the ferrite rod's coil setting. It consists of a piece of ferrite rod an inch or so long with a length of wire soldered into a loop of about one inch diameter at one end. For convenience, tape this loop to the rod. In use, the non -loop end of the rod is brought up to the end of the set's aerial assembly. As it approaches, any improvement in a.m. reception would indicate that the aerial coil needs to be moved farther towards the centre of the rod aerial. By bringing the shorted loop around, any reception increase shows that the coil needs to be moved towards the end of the rod. Do this with the l.w. and m.w. coils separately. When no further improvement is possible, lock the coils with wax. This adjustment is done in conjunction with the aerial padders CT1 and CT2. Before moving a wax -locked coil it's best to soften the wax with a soldering iron or hairdryer. If the tuning gang operates intermittently when turned or is very noisy, tighten the four small nuts that hold it together - one at each corner. To gain access you might have to crack open the gang's casing. Aerosol switch cleaner can be sprayed into a noisy gang to clean the rotor's contacts. Don't use anything that might dissolve the insulation, and leave to evaporate. Check the v.h.f. and a.m. padder alignment after the repair. Alignment is best carried out with a suitable a.m./f.m. generator and an output meter connected across the loudspeaker. Manufacturers use a wobbulator to align the f.m. circuits, but good results can be obtained using conventional peaking. If an f.m. generator is not available the discriminator or quadrature coils can be set up using an a.m. signal, tuning for a null. Breakthrough between m.w. and 1.w. experienced in some parts of the country can sometimes be reduced by reversing the connections to one of the aerial coils on the ferrite rod. Muting The circuit shown in Fig. 9 incorporates an audio muting arrangement. Muting is done by feeding a d.c. signal from the clock's alarm output to the base of transistor Q 1. The alarm tone is fed in at a point after the slider of the volume control so that the control doesn't affect the alarm. No audio output can be caused by Q1 being defective. Anything that results in Q1 being off when the alarm tone is present will mean that an audio output is also heard. In other circuits muting is done by feeding a voltage to the i.c. Faults in this circuit can cause clock ticking - a symptom similar to that described when we dealt with the power supply. With 428 TELEVISION APRIL 1993

43 478 20n 20n 0 +ye ow 20n 4708 Rod aerial 20n 1.6V v 005 r 10 LW O tl r 0 MW 11V p-p 0 LW L L 688 AGC ip0251 Fig. 8: Circuitry used in the first couple of stages of a typical a.m. radio receiver. Audio mute from alarm output Decoupled 4V output ViVN k 1N n 20n 158 1C 10k VR1 10k Vol 1k 560k 101._...t=Alarm MP 0, Rod aerial 1.3V 7 17 Part N DI V 3.6V CT1 r VR1 LW VHF MW MW 1 IVHF CT2 LW 120 C14 C13 VR? 20n 40n L _j AM/VHF switch 07V Fig. 9: A.M. receiver circuitry in chip form. '4V on tune 0.9V off tune cheaper models the audio and tone occur together, the user being expected to turn the volume to minimum to kill the audio output. A variation on this is to use a switch on the volume control to turn the audio off and on. Audio Problems Where the audio signal enters the chip from the volume control but little or nothing is heard check the electrolytic capacitor connected to pin 2 (Fig. 9). With any i.c. that's used in the audio department the associated electrolytic capacitors can be bridged or better replaced during fault tracing. No or uncontrollable volume occurs when the tags of the volume control break loose from the print or their own rivets. Loss of the volume control's chassis connection will result in some chips muting themselves even when the wet finger test is applied directly at the audio input. Spray may cure a noisy volume control. With edge -type controls I prefer to retension the wiper as well. The small loudspeakers used are prone to failure. The magnet becomes unstuck or goes off centre, the speech coil leads fracture or the coil goes open -circuit. Speaker replacement is the only cure. Rattle is sometimes caused by case resonance, a loose item on the cone or the speaker being incorrectly fixed. A speech coil that scrapes against the polepieces produces a static -type interference on loud sounds. What sounds like speaker distortion is often caused by r.f. oscillation in the audio section. Try connecting an 04 [if capacitor across the loudspeaker to see whether this provides a cure. With some sets this symptom arises only after the warm-up period. Scoping the output to the speaker will show that an r.f envelope is present. The problem seems to arise quite often when a TBA820 chip is replaced with its KA equivalent Problems can arise when a PCB is mounted closely behind a speaker and the manufacturer has fitted a piece of insulation to the back of the speaker. Another problem is that solder spikes can short to the speaker tags or case when the set is reassembled. Pointer Drives Finally a few words on station- pointer drives - dealing with these has as long as I can remember been one of the most hated jobs in radio servicing. These marvels of string have given many an engineer a hard time. I still have nightmares about a Rigonda valve radiogram drive system that TELEVISION APRIL

44 became unstrung when my then young son spun the dial when the gang was disconnected. Steel cords took hours to work out and refit. Fortunately the systems used with clock radios are usually simpler. Many have a push-pull arrangement with flexible plastic rods, or a simple direct drive with a calibrated knob. The old problems remain where the drive -cord method is used. The worst fault is likely to be when a pulley snaps off its fixing. A new shaft can be made by drilling and replacement, with a suitable bolt melted in. If a cord diagram is not available and complete restringing is required I prefer to have the gang either open or closed. Starting with the spring under tension (assuming that it's on the drum) I head off around the pulleys, bearing in mind the direction in which the cord has to move in relation to the pointer. About three turns around the drive shaft is enough - take care that adjacent turns don't overlap each other when the shaft is turned in the reverse direction, with the characteristic ping and shudder of pointer. Note also that the direction of the turns should coincide with the pointer movement. End up finally back at the drum. Leave pointer fitting to the last - this will enable the last bit of slack to be taken up. Put a spot of glue or varnish on the pointer and all knots to lock them in place. Nylon drive cord in all sizes can be obtained from a boat chandler - it's sold for sail repair. An easy way to raise the tuning drive drum without unstringing the cord is to release its centre screw. Gently swing the drum upwards, giving it a couple of twists against the lay of the cord. It can then be taped to the PCB, out of the way. Provided you've not moved the gang or the drum it can be refitted in the reverse order. Some radios have an arrangement with which the drum can be disengaged from the drive. This makes life simpler, provided that care is taken about their relative positions during reassembly. Teletopics NIMBUS DEVELOPS LONG -PLAY CD standards battle. There has been a further delay in the USA Nimbus Technology and Engineering of Monmouth hashowever, where a decision has been postponed for five developed a double -density CD with twice the playing time months or so while the FCC carries out a further series of of a conventional disc. The system, known as CD2X, is tests on the four remaining contenders for selection as the based on the use of a special mastering lathe developed by HDTV standard. Nimbus and Dr. Jonathan Halliday. Its longer playing time Meanwhile the partners in VADIS (Video -Audio has been made possible by reducing the pit size, track pitch Digital Interface System), a pan-european digital TV (from 1.6 microns to 1.2 microns) and reading speed (by a project, have agreed to expand its aims to include digital factor of 1.4). Despite these changes the new discs can be HDTV. The VADIS project has developed compression read by a conventional red laser. Nimbus says that CD2X systems that reduce the data rate for a standard digital discs can be played by some of today's CD decks, though picture source from 216Mbits/sec to around 4-8Mbits/sec with some of the newer ones the optical system will need to with little reduction in quality. The compression system be tweaked to focus on the smaller pits. will make it possible to offer digital audio-visual services CD2X is seen primarily as a replacement for VHS and from a variety of sources, including telecommunications the LaserDisc. Nimbus has developed a small video adaptor networks and satellite, terrestrial and cable TV channels. box that plugs into a CD player's digital output socket. It The work is being co-ordinated with the second phase of contains a video expansion chip, type CL450, developed by the international coding standards being developed by the C -Cube Microsystems. This is used to decode the MPEGcompressed video signal from the disc. Nimbus says that pictures the compression techniques will reduce the data ISO/IEC, known as MPEG. When applied to HDTV some players may have the chip built into them. rate from 1,152Mbits/sec to around 12-25Mbits/sec. The The new discs will play around two and a quarter hours' new work involves the development of a multi -layer of video with f.m. quality sound. Picture quality is claimed picture compression scheme that's matched to European to be better than that of VHS. The playing time can be requirements. VADIS members include the BBC, BT, reduced to 75 minutes, offering wide-screen, broadcast - National Transcommunications (NTL), Philips and quality pictures. An additional bit will have to be added to Thomson. the sub -code to tell the player that the disc is an LP one (today's machines recognise playing times only up to 99 minutes, 59 seconds). Nimbus is confident that CD2X will be accepted by video companies but doesn't expect music companies to market LP audio discs. CD2X could also be used to store more Photo CD pictures, and can be used as a CD-ROM to store up to 1.2Gbytes of data. The new system doesn't provide interactive operation and is therefore not seen as a rival to CD -I. CD2X discs could be on sale within a year. Nimbus has also developed quadruple -density discs, known as CD4X, but these require the use of a blue laser and are more expensive to produce. HDTV The MAC system as a way of achieving the goal of HDTV in Europe has to all intents and purposes been abandoned, though a formal decision to drop MAC cannot be taken until the next meeting of EC telecoms ministers in May. The new EC industry commissioner Martin Bangemann has said that Europe will have to follow the US lead when it decides on a digital HDTV standard later this year. Mr. Bangemann sees no point in starting a further global TV SATELLITE TV SES, which operates the Astra satellite system, has decided that its fourth and fifth satellites, due to be launched in 1994 and 1995 respectively, will incorporate digital TV capacity. This will enable Astra to offer a 180 TV channel system from SES believes that the arrival of digital TV is much nearer than some suppose. It considers that the next two years will be the testing time, and that digital TV decoders could be made available as early as next year. The latest Financial Times Satellite Monitor, conducted by Continental Research, estimates that some 65,000 satellite TV systems were installed in the UK in January. This compares with 70,000 in January Continental Research estimates that 17,000 were upgrades, replacements or renewals after a break in subscription. It forecasts that by 2000 some 9.5 million homes in the UK will be equipped 430 TELEVISION APRIL 1993

45 for satellite TV reception. A new range of multi -function integrated receiver - decoders designed and developed by the Pace Micro Technology research and development team is being launched at Cable and Satellite '93. They include the DMAC/D2MAC/PAL MRD950 with integrated Eurocrypt M and S decoding facilities, 120 -programme capacity, concise on -screen multi -language graphics, dual LNB inputs, a comprehensive parental lock facility and automatic 16:9 widescreen format selection. The top -of -the -range MRD960 has the added convenience of a dual card reader for increased ease of use. NEXT GENERATION VCRs Japanese consumer electronics companies led by Matsushita and Sony are holding talks with the aim of reaching agreement on a new standard for the next generation of VCRs, which will use digital techniques for video storage. The use of digital techniques offers the prospect of virtually perfect pictures no matter how many copies are made. It's hoped that foreign manufacturers will support the standard, facilitating the introduction of digital video technology in the consumer market. NEXT MONTH IN TELEVISION CAMERA FAULT RECORDER The causes of intermittent faults are particularly difficult to find, especially when the TV set goes to standby or the VCR to the stop mode almost immediately, removing the fault condition. One approach is to use a camera and VCR to record the operation of the faulty equip - melt, enabling you to get an action replay of the transient fault event. Eugene Trundle explains the technique, describes the system he uses and provides some case histories. Test equipment can be included in the recordings to provide clues. SUCCESSOR TO FM The trade and industry secretary Michael Heseltine has launched a 'national forum' to promote digital audio broadcasting (DAB). The forum will involve broadcasters, equipment manufacturers, retailers and the providers of services. DAB is expected to replace f.m. broadcasting over a year period starting with the first commercial DAB services in A preliminary technical specification, developed under the European collaborative research programme Eureka, has been submitted to the European Telecommunications Standards Institute. Those participating in the project include the BBC, Philips and Thomson. DOLBY NEWS According to Dolby its SR.D six -channel digital stereo sound system is now on fifteen major titles, including Malcolm X, The Bodyguard and Dracula. The new system is compatible with equipment that uses Dolby's older stereo, four -channel and mono sound systems. Yorkshire TV's programme Bad Influence, broadcast on January 28th, was this company's first production to use Dolby Surround sound. Dolby Laboratories has moved to Wootton Bassett, Wiltshire SN4 8QJ ( ). BUSINESS NEWS JVC is to close one of its German manufacturing plants in order to reduce mounting losses. In announcing a 27 per cent pre-tax profits fall in the quarter to the end of December, after discounting the effect of an extraordinary gain in 1991 (otherwise the profits fall amounts to 62 per cent), Sony says that VCRs and camcorders suffered the largest fall in sales, of nearly twelve per cent. Audio sales fell by six per cent while TV sales rose by ten per cent on the strength of worldwide demand for computer displays. The surprise announcement by Matsushita that its president Akio Tanii has resigned has shocked the Japanese business community. Philips is to increase co-operation with Grundig, its 31.6 per cent owned, loss -making affiliate, in an effort to boost both companies' consumer electronics activities. According to Philips "drastic cost reductions can be achieved only if PHILIPS' DOUBLE -SCAN TECHNIQUE Flicker has always been a problem with a 50Hz field rate. Doubling the rate to 100Hz eliminates it. George Wilding describes the techniques used in the Philips FL1.2 chassis to provide 100Hz scanning. r "IT'S ONLY THE ON/OFF SWITCH" Steve Cannon on some recent power supply faults. NICAM AND MAC AUDIO The next instalment in our Modern TV Receiver Techniques series outlines the operation of the digital sound transmission systems now in use and describes the way in which the signals are demodulated and decoded to recover the original analogue sound. MOTORISING A FIXED DISH Ian Martin on installing a polar mount for reception across the s&tellite arc. PLUS ALL THE REGULAR FEATURES To (Name of Newsagent) Please reserve/deliver the May issue of TELEVISION f 2-20), on sale April 21st, and continue every month until further notice. Name Address TELEVISION APRIL J

46 both companies avoid duplication of efforts, especially in development and manufacturing". Philips has an agreement, dating from 1984, to finance Grundig's losses. VIDEO NEWS JVC has launched a budget camcorder, Model GRM3, at 599: features include a x8 zoom lens, video light and wired remote control. Nokia has just released three new VCRs: two of them have a built-in VideoPlus timer system. The Grundig GV201 at 360 includes text programming with Startext and an automatic cassette identification and play time indication system (ATTS). Sharp has launched an LCD projection TV system, Model XV710P, at 1,800. It can handle PAL, SECAM and NTSC signals and can project an image with a diagonal size up to 100in. Sockets are provided for S video, composite video etc. It uses a newly -developed metal -halide lamp which costs about 180 and has a maximum useful life of around 4,000 hours. For the brightest and clearest picture a 60in. polarising screen (Model XUPP60S) is available at about 1,290. Simple ESR Meter for Electrolytics Ray Porter, M.Sc., C.Eng., M.I.E.E. In an article in the January issue I described the way in which the effective series resistance (ESR) of an aluminium electrolytic capacitor can increase so that it no longer acts as a low -impedance component. This explains why a fault is often cleared by replacing an electrolytic capacitor even though its value, when checked with a capacitance meter, is close to that marked on it. In view of this I decided to design a simple meter to measure the ESR of electrolytic capacitors. Its range suits the ESR values of PCB -mounted electrolytics. By checking against standard values (see Fig. 3) you can reject lossy capacitors. The tester makes use of an operational amplifier as a negative -resistance oscillator. Since the operation of negative -resistance operational -amplifier circuits doesn't seem to be well known a short explanation of the relevant theory is provided later. Circuit Description The circuit produces a negative resistance to cancel the ESR of the capacitor being tested so that there is continuous series resonance with a fixed inductor. Fig. 1 shows the circuit diagram of the meter. The negative resistance is produced by IC lb: Cx is the capacitor under test and LI the fixed inductor. VR1 enables the negative resistance to be adjusted. Rotate it until oscillation stops: the ESR value can then be read from a scale fixed to VR I. When there is no negative resistance present LI and Cx form a series resonant circuit that's damped by LI 's resistance and Cx's ESR. This circuit will ring when energised by an impulse. IC1 a is used as an oscillator to produce a squarewave output at a frequency of a few Hz. This output is differentiated to produce the spikes (impulses) that energise the resonant circuit. When the capacitor's ESR and the resistance of RI are cancelled by the negative resistance the ringing becomes a continuous oscillation. LED D1 is then on. When the oscillation is stopped by reducing the value of the negative resistance the LED goes off. If a short-circuit capacitor is connected to the tester the LED comes on with full brightness. When the resonant circuit is oscillating the LED is illuminated on only the positive -going half cycles: it therefore glows at half brightness. IC 1 d provides a half -supply voltage reference for IC1b. Si varies ICIb's gain, changing the negative resistance to provide 0-1, 0-10 and 0-100Q ESR ranges. Construction The circuit was built on a piece of stripboard which, with a PP3 battery, fits easily into an ABS box. L1 was wound around the four pillars on the inside of the box's lid - see Fig. 2. It consists of 42 turns of 30 s.w.g. enamelled copper wire. This results in a coil with a resistance of 3.20 and an inductance of A different wire gauge could be used, but its resistance plus that of R1 must equal 100. With the coil as specified above a 1,000g capacitor in S1 positions: 1 = Off n n C1 R2 Sta - 1.n. R6 LI R1 C2 9V R19 R7 %Rig VR1 R3 Sib V 1 R16 IC1d R Sic Roomy R R15 ID 019] Fig. 1: Circuit diagram of the ESR meter. 432 TELEVISION APRIL 1993

47 position Cx produces oscillations at 70Hz. A 1p.F capacitor increases the frequency to 10kHz. When testing the circuit I connected a crystal earpiece via a 100nF capacitor to R19 to check for oscillation. The clicks of a square wave can be heard when VR1 is set far away from the position that stops oscillation. As the critical setting of VR1 is approached the pure sound of a low -amplitude sinewave is audible. Calibration Start by using a known good 1,000µF capacitor with a voltage rating of at least 25V in position Cx. Adjust VR1 until the LED goes off. Mark the scale 040. Now add known -value resistors in series with Cx and adjust VR1 until the LED just goes off. Mark the scale with the new total resistance value. You may find it convenient to use increments of on the 10 range and suitably larger increments on the other two ranges. Interpreting the Results Fig. 3 shows typical ESR values, based on manufacturers' data and allowing for the fact that ESR measured at 10kHz is usually one third of that measured at 1 khz. The ESR values with 10V normal grade capacitors can be seen to be four times those with low-esr 63V types. Thus when a low-esr type has deteriorated to the point where its ESR is the same as that of a normal electrolytic its internal heating will have quadrupled! If you find that the measured ESR value is more than twice that shown in Fig. 3 the capacitor is past its best. ESR values for capacitors with voltage ratings other than those specified in Fig. 3 will be between the relevant lines on the graph. Fixing pillars for Ll / Off mm VR1 Si.t; too O D1 95mm c Fig. 2: Front panel layout Negative Resistance with an Op Amp When a voltage increase is applied to a negative resistance there's a current decrease, i.e. I = -V/R. Two operational -amplifier configurations exhibit negative input resistance. They are shown in Figs. 4 and 5. The one to use depends on the source resistance of the circuit to which it's connected. This is because the circuits use negative and positive feedback simultaneously, the source being part of the feedback potential dividers. If the proportion of Components list R R8 47k R15 150k R2 1k R R16 1.1k R3 1M R10 120k R17 2k R4 100k R11 120k R18 11k R5 10k R12 33k R19 10k R6 270k R13 2.2M R20 10k R7 470k R14 150k All 0.25W 5% VR1 100k C1 2.2nF C2 220µF, 15V C3 01 LIF C4 10nF IC1 TL084CN Tr1 BC547 Tr2 BC557 Tr3 BC547 D1 Red LED L1 14m of 30g enamelled wire - see text S1 3 -pole 4 -way switch ABS box, stripboard '0 ' p F Fig. 3: Typical ESR values, A 10V normal grade, 13 25V normal or 10V low-esr grade, C 100V normal or 25V low-esr grade, D 63V low-esr grade. OV +V Fig. 4 (left): Negative -resistance op -amp circuit when the source resistance is less than R. Fig. 5 (right): Negative -resistance op -amp circuit when the source resistance is greater than R. the output fed back to the non -inverting (+) input in Fig. 4 is too large or the stage gain in Fig. 5 is too great unwanted oscillation will occur and the circuit won't function as a negative resistance. Conventional current notation is used in the following explanation. In Fig. 4 the values of R2 and R3 are equal. Thus when +V is applied to the input the output rises to +2V. The voltage across R is then V and its direction is such that I must flow out of the input. So the circuit's input resistance is V/ -I = -R, which means that the input resistance is of magnitude equal to R but negative in value. The same analysis can be applied to the circuit shown in Fig. 5. Remember that these circuits will be stable only when the source resistance is as shown, and that operation as described is possible only when the operational amplifier's normal voltage and current ratings are not exceeded. OV V +2\ 0023 TELEVISION APRIL

48 Camcorner Reports from Brian Storm and David C. Woodnott Panasonic NVMS2B This camcorder would play back a tape quite normally if the record tab was removed but a virgin tape would be greeted with high-pitched whistling that drowned out the sound track. In these machines the tab switch enables Q6003, which then feeds 9V to various places including the 2SB1219 transistor Q4005 that produces the delayed 9V record voltage. The problem was that Q4005 was passing about 2.5V to the record circuits even when no switching voltage was applied to it. A replacement cured the fault - it's a surface -mounted device. B.S. Panasonic NVMC5 This rather elderly camcorder came in with a request for an estimate for head replacement and a service. Despite the machine's apparent age the mechanism was clean and sparkling, with no signs of wear and tear. When our test 'C' cassette was played back however we found that the output from one head was missing. As I suspected, replacement heads produced no improvement. So attention was turned to the head amplifier pack and the flexible connector from the drum to the pack. Removing and resoldering the connecting pins cured the fault completely. B.S. Panasonic NVMC20 This camcorder was accused of bloody-mindedness: it would sometimes refuse a tape, just ejecting it then leaving the cassette door open! It performed beautifully on test of course, showing no inclination at all to misbehave. After a call to Panasonic a nice man called Phil assured me that a replacement mode switch would cure the problem. It's part no. VESO416 and did the trick. B.S. Sony CCDF340E The symptoms were no sound and intermittent VTR functions. Neither fault was difficult to cure. The no sound fault was cured by replacing the microphone preamplifier chip IC585. A damaged flexi board was the cause of the intermittent VTR functions (how do they get damaged?). D.C.W. Ferguson FC28 The fault report said "won't always switch on and, when working, won't always switch off'. I thought that this was probably a mechacon reset problem but inspection revealed nothing more than a faulty power switch (SW617). Note that with these machines the response to a selected mode, e.g. power on/off, play etc. is not always instant - a sort of "soft" response to commands is often evident (or is it me?). D.C.W. JVC GR65E No autofocus was the problem with this one. The motor assembly proved to be at fault, with a jammed gearbox. The initial drive from the motor is via a belt that's connected to a reduction gear (a sealed unit). It was this item that had failed, possibly because the slipping clutch assembly, which 434 is the final part of the autofocus drive to the lens assembly, was locked tight and was unable to slip when required. Manual focus adjustment probably caused the gearbox failure. D.C.W. Sony CCDF450E I suppose we all get caught out sometimes by diving in too deeply. The symptom with this machine was intermittent playback functions, including fast-forward/rewind search. Recording was o.k. After some abortive in-depth investigations I discovered that the power switch (camera/player) made intermittently poor contact in the play mode. A replacement put matters right. D.C.W. Panasonic NVMS1 Sound recording via the microphone was o.k. when listened to using the headphones but there was no output from the A/V out connector (the picture was o.k.). Playback sound was also available only via the headphone socket. The cause of the trouble was that the 2SD1328 audio mute transistor Q4013 was short-circuit emitter -to -base. Note that it's mounted at the opposite end of the main PCB to most of the audio circuitry. D.C.W. JVC GRA30E Two of these came in at the same time from the same source with the same fault - no functions, with the emergency mode indication E01 in the viewfinder. This means that the 8V supply is missing. Amongst other uses it appears as the r.f. unit supply at the AV output socket. The cause of the trouble was a faulty AV lead, which had been tried with both cameras. Unfortunately there's no fuse in this line to protect the main d.c.-d.c. converter. So two converters had to be replaced, which was a costly exercise. In view of the fact that it's an easily produced fault it is surprising that better protection wasn't incorporated. D.C.W. Sony CCDV88E This machine would shut down intermittently in the play mode and just sit there looking at you. Careful inspection at the instant of failure revealed that just before the shut down occurred the capstan motor's speed rapidly increased. We decided to investigate the capstan FG circuit and found a dry -joint at pin 16 of IC503, the capstan FG waveform shaper. D.C.W. Fugix M890 This machine is a clone of the Sony CCDTR75E. The problem was an intermittent trigger button - the sub - trigger button worked all right. Unfortunately the trigger button switch is available only as part of the complete control assembly, which includes wide/telephoto toggle, play, record, pause etc. and all the operation keys. A replacement is costly, especially when only one key function has failed. D.C.W. TELEVISION APRIL1993

49 TV Fault Finding Reports from Philip Blundell, AMIEIE, Richard Newman, Paul Hardy, Chris Watton, John Edwards, Michael Dranfield, Brian Storm, Steve Cannon, Alfred Damp, and Geoff Fardon Philips K40 Chassis This set had no sound or vision - there was just a blank raster. Tracing back through the signal path with a signal generator I obtained activity when injecting a signal at the output of the TDA2541 i.f. chip but none when applying the signal to its inputs. The voltages at the input pins were different: they should both be at 5.2V but pin 16 was low, with a 1.51S1 leak to chassis. The other input (pin 1) didn't have this leak. Disconnecting pin 16 proved that there was internal leakage via the chip so a replacement was fitted - to no effect! What else that could cause a low resistance from pin 16 to chassis was connected to the chip? Nothing seemed to be likely until I looked in the SGS data book and found that pins 2 and 15 have decoupling capacitors connected to them. The one connected to pin 15, C2115 (22nF), was leaky. P.B. Philips CP90 Chassis When checking this chassis for dry -joints one place where you might not think to look is in the i.f./sync can. Dry - joints can occur in this can, especially around the TDA 2579 chip. P.B. Philips NC3 Chassis There was a blank raster though sound was present and the on -screen display worked. A check on the waveforms around the TDA3565 colour decoder chip showed that the sandcastle pulses were present and a video signal went in, but nothing came out. Voltage checks then showed that the brightness control pin was high - 2.5V instead of 0.6V at the maximum brightness setting. A new TDA3565 was required. P.B. Philips 2A Chassis The power supply was dead. Checks showed that there was 0.6V at the base of the BUTI1AF chopper transistor and over 300V at its collector, but the circuit wouldn't oscillate. As there were no shorts across the secondary windings of the chopper transformer attention was turned to the snubber network connected to the primary winding. D6663 (1N5062) was found to be leaky - 150S2 both ways. P.B. Philips G110 Chassis When the power supply in this chassis breaks down Philips supplies a complete repair kit. You must replace all the parts supplied. I recently had one of these sets come in from another dealer who said that although he'd fitted the power supply kit the set would shut down after an hour or so, just as though it had been switched off. Sure enough the set did exactly as he said. When I checked the 140V supply I found that there was virtually no voltage here while the supply from the mains bridge rectifier was down to about 20V (instead of 280V). Two of the bridge rectifier diodes were going open -circuit when warm. I replaced all four and had no further problems after that. When I spoke to the dealer he said that he hadn't bothered to change the diodes, although they are part of the kit, because they had measured all right. A lot of frustration could have been avoided if he had heeded the manufacturer's instruction to change all the parts in the kit. R.N. Questar CTR14 This set was dead. I'd seen it about a year before for a similar fault and had had to replace 8652 (390k0) which had been open -circuit. It again had to be replaced, but this time the STK7348 went short-circuit at switch on, taking with it R651 (2752, 2W) R653 (1.552, 2W) and C655. Everything was fine when these items had been replaced. P.H. Contec KT8135 There was no luminance. The cause was a poor plug and socket connection for the luminance drive on the c.r.t. base panel. P.H. Hitachi C14P218 (G7P Mk 2 Chassis) This 14in. portable was stuck in standby. A check at the collector of the BUT11AF chopper transistor Q903 produced a reading of some 300V, so obviously the mains bridge rectifier diodes etc. were o.k. Two series -connected 82kS2 resistors, R902 and R903, provide a start-up bias for Q903. They are at the front, right-hand corner of the chassis and were both open-cilcuit. Another fault you get with these sets is that the screen goes very bright then the set trips. The cause is that a capacitor near the line output transformer becomes dry -jointed because a part of the cabinet back pushes against it, eventually forcing it from the panel. The capacitor concerned is C711 (47g), which is the reservoir capacitor for the h.t. supply to the RGB output transistors. I cut the offending portion off the inside of the cabinet back - it doesn't seem to have any purpose. C.W. Matsui MB10 "Dead on mains" the report said and a quick check with the bench 12V power supply proved that the set was otherwise o.k. So off with the back and into the chopper power supply on the left-hand side. The primary supply was present but there was no oscillation. I noticed a capacitor on the print side of the panel: it was not shown in the circuit diagram and was connected between the h.t. line and the collector of the chopper transistor. A check showed that it was shortcircuit, thus preventing any current flowing in the chopper transformer's primary winding. A replacement restored mains operation - it's a 4,700pF capacitor with a voltage rating of 2kV. C.W. Toshiba T211T4BA When I switched this set on it seemed to work all right but as soon as I changed channel it began to search tune down - TELEVISION APRIL

50 I: AZ ELECTRICS... INTEGRATED BA _ MC14497P SASIiW 0150 S TA7335P C420 IDA1470 MOO UPC RCURS BA HA1377 _ E7-00 MC CP SASS%) M50 511(7348 csoo TA TD43567A. MOO UPC BA3213.L1.10 HA1338. C4.00 LA C1451YUPC1458 SL1433 MAO ST X TA MO UPC AN BA MA L MOO TA BA333.C1.40 MA1394. G.03 U41017/ MOO S _ TA DA3590 MOO UPC AN253P 1.80 BA : :1 S1471DP 0.20 STR10716 C L C AN HA LM SLIGO 0.30 TA71307AP TDA1515A C250 IDA3461A UPC1520CA A U/1036N 0310 SAGO 0.00 STR4C TA7909P TDA F1A STR TA75I DA STR TA7628P LMINCO MA A.9505F UPD CAM TRANSISTORS AN FID4539 M70 L (Brreo18) STR451 SSA1075 _ S1R454._...G16 TA7629P CIAO MOO MOO SSA1250 _ STRE0020 TA7830P MOO AN5512. riss L LIA ST150103A TA DA MA E ST1R BA5204. L LA1331N.675 STA401A _ STR DA AN L7806. ST TAM% TAME A19336 _0.75 IDA STA441C CLCO TA DA4503 CA50 AN5760 MOO 13/ LIA386N 440 ST STR TA7581AP CIAO 1DA C / PL ST SV1.4393C DA2003 C $A564 M LM6402G-2003 ST TM100 MOO TA76913A DA2C I3461: M TAA moo. EOM TA4193 _ TA76913AP 1:750 TDA2005 T1.70 1DA E A L ST TA _ TA7105P EOM LM PIN C150 TM TA7709. AN L C115 13/ TA7738 C x /74814 E TA4350. MOO TA73.010/ S TD TDA E8772_ LA1180 M104. STX T _ TAIWAN LA.25 TDA7805AP LA N.0.90 TA TA13102P AN LA _ II VOL* MOO MHO 2SC1413A 0150 M BA6238A E195 LA M ( TA71713AP I MOO 25(1826 C MOO A BA LA /60127AP _MOO II... MOO 1.4P04011C 000 TA7193AP C BA I P MPT34069C _ STK430. MOO TA7193P MOO IBA120S LA ST TA / MA E41003 MOO 29: AP AN BM3302A.010 LA / P CL70 071( _ 750 TA72C6AP A560. C1.00 MA E41014 MOO 2S02027 CA.50 1/PC145148C ANE T TA N LA CIAO MPD TA COM MA DA TEA BA LAX P x TA7230P =5 050 A/ BA LA3700 C ST I10.50 TA7232P C ADAv Emo TL011CP : BA LA S TA7233P 1210 TCA TDA TL072CP _..._ A (10 S C10.50 TA DA AP E B CNX62A HA11215A LA MOO LA LA L GOO SAA SAA1251.._ ST ).0650 TA7241 TA7241AP TA TDA A TDA /0 " /82L CLOO SC = AN DA2560 E3.75 AN MAI LA _ _ 450 ST _._.692 TA TDA TDA2600 T MOO 23C A r4.50 I LA SAA TA7267P AN7205 CI LA /54519P..._ SAA TA7270P _ SC LA X TA7271P L MOO U TDA14022P FAA U S Al A1124A E1.75 LA / TA AN LA K TATA13 MOO 10/ ( LA P TA7280P MOO 10A UA * _.._ DUO P S1K TA TDA = IN F1A :3.50 LA / MOD TA7281P 0(75 UM1006DP F C120 IA MO MA1044U C456..1:1310 A MOO FIA11747A L/ / T1( TA DA LA M150 -E..._. 220 AN LA13058.E5.00 M TA DA2611A UPC1185H2 UPC1225H MOO 0275 AN LA ( UPC1230/ MA12017 MOO IA TA7313 also M LA TA7313AP 0.40 TDA1170S UPC133131/...0(95 A C1.40 MA LA MC SIX I UPC1361C 2SD TDAIIKP MCI4001BCP C1.10 TAM. MOO 1DA PA CO LA TDA12700A LA MC14426P 020 SA ST LA C14426P S1 ( TA DA1412 CLOD UPC1377C UPC1378H Design your own satellite system! You can with the help of this brilliant new program by DJ Stephenson SATMASTER Version 4 Only 35 Allows you to design a system and test its performance before you install it! Provides essential dish setup angles: polar and apex elevation for motorised systems, elevation. azimuth. polarisatioixoffset. front any location in the World for arty geo-satellite - now and in the future! Includes magnetic map and footprints for all popular satellites across Europe. Easy -to -use pop-up menu interface makes tedious tasks simple for everyone! Complete with User Instruction Manual! Contains 20,000 word on -screen technical context -sensitive helpline. with faultfinding. cable specs and site survey guide. Calculates full link budget including dish size optimisation to ensure the best quality picture! require. IBM PC compariblr vilh MS DOS in or higher. end I MB hard Plots beamwidths and lobe patterns so you can judge potential interference from neighbouring satellites! Results and graphs can be output to file, screen or printer! SATMASTER PRO Only 69 Contains additional country/town files! Supports laser printers! Displays CCIR rain -climatic zone map! Takes account of circular or linear polarisation in link budget analysis! Lists polar and apex angles per town! Calculates rain fade margin automatically Avoid guesswork... order SATMASTER V4 or.satmaster PRO today! Swift Television Publications 17 Pittsfield, Cricklade, Swindon SN6 6AN Tel or Fax Please send me program (3.5" disk): SATMASTER 35 0 tick choice (/) I SATMASTER PRO@ EH 0 Postage 1 in UK, Europe add 2. Other add 4. I enclose cheque/po for made payable to Swift Television Publications, or I please debit my AccessNisa credit card. No Expires: =EN Name: Address Postcode: I EST i J.W. HARDY YOUR OflESTOPSHOP FOR THESE FINE BRANDED PRODUCTS - AND SO MUCH MORE... WOI51EL-1 SMATV DIAMOND AERIALS UHF/FM GLOB/ COMMUNICATIONS FIRST IF, SMATV J.W. HARDY labgear Cablevision SMATV IN PACE communications UHF AERIALS UHF AMPLIFIERS LENSON HEATH SATELLITE ANTENNA SATELLITE RECEIVERS, DECODERS PRONAAX retiff5 BOLTS PLUGS TeLep SMATV TRIAX AERIALS UHFNHF Unii0Fo)k U K PAKEM TEST EQUIPMENT mun o LEX X SATELLITE, RECEIVERS BOLTS PLUGS TOWER CLIPS CLIPS VO COAX CABLES RAYDE WE PROVIDE FULL TECHNICAL ASSISTANCE AND SERVICE BACK UP ON ALL OUR PRODUCTS SMATV - DISH SHARING - DESIGN CONSULTANT Trace Price Us available to bona fide TV Aerial and Satellite Dealers on proof of trading. J.W. Hardy, 231 Station Road, Stechford, Birmingham Telephone: TELEVISION APRIL 1993

51 18 BROOKWOOD ROAD, SOUTHFIELDS, LONDON SW18 5BP. TEL: / FAX: TRANSISTORS Cant E SOC E POO CAM C4.50 2SD COM 2SD S S C C C200 BC MSS BC C C BC BCi C BC BC171 COM E BC172C CO E1.10 BC S0E37 caw BC woe TDA8190 ORIGINAL 9.50 TRANSISTORS BF422 BC164 COM BF BC BF C F46943F OF BC214L C R37013F C serum BU BC E0.07 BU BU208A 9.10 BC U BUMINT BC BU326A AI E0.25 BU406 COM (14060 E1.50 BU BC A E103 EI C1.00 BC BU508A C0.07 BUSMAF C COM C BR BR303 E E0.10 6RY CORM 6T moo 81126P C P BT151A2011 E1.75 1< A.91 C M 7127 DOM RGP15G 0245 RGP yiewskezoz 9190 RG1715K v RGP30K e COM RH9 raw ic v206 (8YeleiR. C0.56 SKB Y210/800/BYV98 Mao 1:0.56 SKB2C18 C SKEte2. ASK FOR 'esecorrouctors NOT um's) VIDEO HEADS AMSTRAD 3HSSR-VCR7003 (Sas)1010/ 1) PSF1.VCR4500, PSF2.VCR4600, PSF3-VCR FERGUSON 3HSSV-2 Head Averse HSSVA-3V42,44,45,46 6t HSS4VB-3V32/HR FISS4VC-3V48MRD V48,58,59.65,FV , And rnost other Fergusons HITACHI IISSHA-VT80:0,9000 sores SSEIEE1711,33 et )7120, VT130, PANASONIC 3iSSN-2 Head universal HSSU1N-NV100, Ftileps VR HSSU306NV230, ,15PX 17,80 VIDEO HEADS Continued 3HSSU3N-NV430, HSS3N-NV HSS4NB-NV SS4NA-NV366 NVG , most other Partasonics_ SHARP 3HSSSP-VC , , 482,483, C AISSSP6-VC , etc VC7000,8000 series (Brassl OTHER MAKES Alba 4000, &Ostia Sentra 8000, Solavox Fisher FVHP ,530, etc Fisher VBS7000,9000 etc.c25.00 Hinan VXL2,4,3,20, !linen VXL5.620H mitsunshi HS306, Onon VC150,180,VH12.3 etc... sash VR , Samsung Universal 2 Head Toshiba V71,73.74, ,84,85.87 C17.00 Toshiba V93 C19.00 ASK FOR VIDEO HEADS NOT LISTED The above heeds are new. BELT KITS A range of belt kits in stock from 60p to Makes for most models available including: Alba, Akai, Amstrad, Ferguson/JVC, Fisher, Funai, GEC, Goldstar, Granada, Grundig, Hinari, Hitachi, Mitsubishi, NEC, Orion, Panasonic, Philips, Saisho, Samsung, Sanyo, Schneider, Sharp, Sony, Tensai, etc - Please state model and make. CLUTCH BASE Hitachi 529 at 4.50 LINE OUTPUT TRANSFORMERS LOPT Hitachi 2174,76, LOPT Hitachi CPT LOPT Hitachi CPT2276 etc LOPT Matsui Dacca 100 E9.50 ITT CVC ITT CVC25/30/ ITT Compact 80 Series ITT Compact 80 Series 90 f19.75 ITT CVC ITT 1109F ITT CVC ITT CVC800/1/ ITT CVC ITT CVC1150/ ITT ITT ITT 1200/ Other ITT transfommts available Y228 E0.50 SKE1M15 COM v229 C1.15 SKE2G E0.50 SKE2G CO.30 SKE4Flipt cola Fidelity all models up to 20' DOM YVAD 2.56 SKE4F Fidelity Panel for ZX SKE5F YW96E 0850 SR2M 0.75 Fidelity 22' D( X10 C0.50 T9053V 9.40 Hind C74156 TVA Philips KT TRIPLERS Universal Tripler Universal Tripler with focus unit Dacca 120/130 series tripler Ferguson 9000 rioters Thom TX10 Focus Unit Kit Trip Grundig CUC2401 etc Hitachi and Matsui LOPTs In stock at VIDEO MOTORS A range of Reel Motors made by Ferguson, Hitachi, Sanyo, Sharp 8 Romanic are available, please state model and make. We stock capston motors, makes include FerguscrVJVC. Hitachi and Sharp. Also available are Ferguson Mode Control Motors, theme state make, model Sharp Reel Motor Pulley only C12/3 Replacement of plasoc pulley on a number of Sharp Reel Motors with the 5 above metal pulley gives better rewind/ff performance IDLER ASSEMBLIES SANYO 3HSSSY-VHR1100,1110,1300 E1800 FERGUSON 3HSS35v-vHR Take up Gulch (Mechanical models) 3V29/30 Take up lam 3V29/30 Take up Catch 3135 Reel Infer 3V35,36,38,39 Take up Clutch. 3V FV10,11,12,13,14 Idler Arm..., Clutch Assembly 3V ,49.52,53, Mode Motor Assembly 35)35.49 al C12.50 Prices subject to change without notice. Please add 1.00 per order for p&p and then add 17.5% VAT. E5.00 E C3.00 C C11.50 Clutch Assembly 3V42, FISHER FVHP615,905,910.1dIer Assembly Original.. FVHP615 Gear der Assembly FVHP905,910 Gear Idler Asserrdy FVHP Ier HITACHI VT11,33 etc. Original Idler Arm. VT11,33 etc. Wier Replacement VT9330,9500 elc. Ray Idler_ VT9300,9500 etc. F/F Idler... VT et. lam VT etc. F/F Rew tiler... VTI etc Play Icier... VT etc. FF/Rew Pulley... VT11,33 etc. Clutch Asserndy VT400,500, series clutch/base oomplate PHOUPS E C5.00 C3.00 ran C365 C E2.95 raw VF6460,6920 Idler Arm (Onpnal)... C3.00 DV464,6462,6463,650 etc Idler P. Kid (Ongral) 4.50 VR6542,6843 Reel Idler E6.50 VR6542 Reel Dove Paley C7.75 VR6843 Reel Drive Puley 0.00 PANASONIC (AU Original) 7-N370 Idler Arm Lim VXP0521 Gen 3.00 NV8600,8610 Play Idler VXP NV332,777,778 Idler line VXP NV333,366 der Arm 2 OM VXL NV8400,8600,8610 etc. VXP NV333,366 etc. Idler VXPO4C1-NV700,7200, 7800 NV2000,3000 Play der VXP0331- NV kler 5106 VXP G Mech. Ray Gear VXL 1490 [190 Back Tenon Bands Rom [1.50 All Panasonic Maintenance Kits POA QUOTE PANASONIC PART No. FOR PARTS NOT LISTED SANYO Idler VHR1100, Idler , Reel Dove Pulkw Urrit VTC Idler Roller Assembly VTC5000,5150,6500. Thom TX100 Green Spot SHARP Ferguson TX90 LOFT specify size screen... E17.75 Ferguson 3V35036 Mains Transformer.. MAO Idler VC93C etc [1.78 Ferguson 3V44/45 Mains Transformer Idler kongetab VC Sony- Please state model for price Idler Assembly rongnall VC ,685 D5.50 SPECIAL OFFER PSF3 Genuine complete may mt...e17.50 Idler Assembly (original) VC ,785,787, 793 VCT72 AMSTRAD CS ,4600 MOD KIT INCLUDES PINCH ROI I FR AND IDLER CLUTCH ES -00 Umber Poet Assembly MMus er Models Hewn VXL4, Matsui 1X730, ,800A,810,820,880,4610 Ssisho VR1100,1200, , 1600,2500,3200,3300,3303X,3500, 3800,3700 IDLERS FOR AKA, SAMSUNG, MITSUBISHI, NEC, ETC. IN STOCK C1 TS REMOTE CONTROLS Bust, Ferguson, Grunag. ITT Phew Pye, Sony, Hitachi, Matsui Logik. Panasonic. Sasho, Sabra. Samsung, Trishaw, Tatung, Toshiba. Various models TV 8 Vida. From MANY HrACHI TV REMOTE CONTROLS NOW IN STOCK SONY REMOTE CONTROL RUBBER PADS. STATE MODEL FOR PRICE Universal Remote Control Toptel UnIvaesal WC E2&00 TV CN/OFF SWITCHES ITT Philips, Decca Thom. Frdelity, Grundig, Sony and Hiachi. State model for once SONY PUSH SWITCH 70p MAINTENANCE KITS Available for Alba, Amstrad, Ferguson, Fisher, Goldstar, Croodritans, Granada, Hiner, Hitachi, VC, Matsui. Maude,. Mara Panasonic, Philips, Samrci. Sabra, Schneider, Strobe Sharp, Sony, -adult, Toi.hitia PINCH ROLLERS A range a Pinch Rollers is in stock, most of ;item (a MOO. Makes include Akai, Amstrad, Ferguson. Fisher. Funai, GEC, Goldstar, Grundig, Helen, Hitachi, In JVC, Marantz, Mitsubishi, NEC, Nordmende, Orion, Panasonic. Philips, Samsung, Sanyo, Schneider. Sharp, Sony, Tensai, Thomson, Toshiba etc. Please state model and make. Phihps Patch Roller for models V196180, 6185, 6285, 6362, 6367, 6467_64138, 6470, 6561, ,6761, BACK-UP BATTERIES Philips 1 2V Bask up Battery 1.75 Philips 2.4V Back up Battery k. MOO Ferguson TX Wider Range Available OTHER SPARES Unwersal -Video Copying KA UreversO Copying Kli (Scan) Video Cassette Lamps from Video Tape Splicing hil Hatch TV Frame Module Hitachi TV Franc Module HM CassetteHousing Assembly Ferguson 3V35,36,38,39,42.43, Cassette Loading Roller Assembly V31,3V V Back Up Cap._.._11.85 Degaussing Pootor Blue 4.00 Degausing Pond Mate Cassette Housing Assembly Beach, VT End Sensor for Beach VTE (Pair) Caseate LED Servo for Panasonic etc 150 I C Gras Protectors 1580 Clear Service Cassette Satellite LNB Video tors Spmg Kid Video Ki Asher 8 E Clip Kit.. Universal Video head Puller Akai VS22 Serves Power Board ScIdering Iron 25W From C7.90 C MANY OTHER VIDEO AND 7V SPARES IN STOCK Back Tension Bands n Stock for Akai, Fisher, Hitachi, Ferguson, JVC, Mitsubishi. Panasonic, Sanyo and Sharp. * t7 i7 SEND FOR PRICE LIST. Trade Counter now open Mortify -Friday Saturday Nearest Underground Sieben - Souttitleide District Line. Closed between 1.30pm -3.00pm Every Friday gam F.* 0 a e *0,1 A E L E C T R C S TELEVISION APRIL

52 wards. If the down button at the front of the set was pressed the search would stop for a short time then start again. A new 47C232AN4984 tuning chip (ICA11) cured the trouble. C.W. Finlux 3029 (3000 Chassis) This monster set suffered from what could be described as "line spacing": the top quarter of the picture was o.k., but towards the bottom of the screen every other line appeared to be blanked out. A fault in the field output stage seemed likely so several components in this area, including the field output chip, were replaced. All to no avail until we came to CK8 (0.1g, 63V). Replacing this cured the problem. It's a small, white square -shaped capacitor positioned beneath the field output chip's heatsink. J.E. Hitachi CPT2188 (Salora K Chassis) This set was dead. There was a distorted waveform at the base of the line output transistor and an almost identical waveform at its collector - a check showed that its base - collector resistance was only We didn't have the original type (2SD1577) in stock so we decided to try a BU508A instead. The 2SD1577 has an insulated body, so its heatsink is soldered to chassis. The BU508A was therefore mounted on the heatsink using a conventional mica insulator, spacer and bolt system. A long test run showed that the transistor ran cool. J.E. Tashiko 20F862 When this set was switched on the standby indicator flickered briefly but the set otherwise remained dead. The cause of the fault turned out to be C701 (47g, 450V). For good measure we replaced C506 (47g, 450V) as well. J.E. Salora K Chassis For tripping out when changing channel, also the field output chip IC501 having a very short life, check choke L601 in the line output stage. In the set we had in L601 looked as if it had got very hot and clearly had shorted turns. M.Dr Hitachi CPT2656 This set wore a Finlandia badge but we were able to match it up with one of our Hitachi service manuals. Over a period of eight months it has been back to the workshop on several occasions, but each time it failed to display any fault during a soak test. The customer's complaint was that the bottom part of the picture was missing. Despite replacing many components in the field output stage the set kept on coming back. It was difficult to know what to do as we'd not seen the fault. On its latest visit however the fault put in an appearance: after about an hour the bottom of the picture began to cramp up while the top widened out. By feeding a crosshatch pattern signal to the set we could see that the actual symptom was change in linearity. A slight touch on preset RTB573 (4700) cured the fault. So a replacement linearity potentiometer was fitted and the set was handed back to the customer with confidence. M.Dr. Panasonic TX21T1 (Alpha 2 Chassis) The complaint was about an intermittent whistling noise when the set was first switched on. Sure enough a highpitched whistle came from the set when I switched it on, stopping as soon as I touched it and then not to return until next day. In fact any attempt to touch the set cured the fault until next day. Many days later the cause of the fault was traced to a dry -joint on the line output transformer's overwinding - the point that provides sync between the line output stage and the chopper power supply. B.S. Ferguson TX10 Chassis We don't get many TX1Os in these days. This one gave us some real grief however. It had been in for almost a fortnight, running on soak test, and the fault complained about was just beginning to put in an appearance. At switch on first thing in the morning there was field bounce. For only five minutes mind, then it would work perfectly for the rest of the day. Even switching it off and leaving it for a good few hours didn't seem to make any difference: the set would fault only between 9 and 9.15 a.m. We'd tried freezer of course, but this didn't give us any definite clues. Then one morning the fault showed up for a lot longer than usual and also developed further: there was intermittent field rolling and the line sync jittered. Well it was now or never, so on to the bench it came. We replaced the TDA2578A timebase generator chip IC742 as this was the obvious thing to do. It didn't help, but at least the fault was still present. As both the line and field sync were affected I suspected that the cause of the fault was around the input to the sync separator. A scope check was made on the video waveform at pin 5 of the TDA2578A chip and at first glance it looked fine. This point is biased by R759 and R753, which are close -tolerance components and have given us trouble before. But replacements made no difference. Upon closer examination of the video waveform the line sync pulses did seem to be rather thin, if you know what I mean, so maybe there was a fault earlier in the video processing. This seemed a bit of a long shot. I couldn't compare waveforms, and the one we had wasn't far removed from the oscillogram shown in the manual. But to prove a point I found a signals panel and transplanted it into the set. Sync lock was now perfect and, looking at the scope, the pulses had certainly put on weight. The original panel was refitted and scope checks showed that the video waveform was faulty right back to the i.f. panel. When this was swapped over the fault had cleared. Now the set was on rental, so I contemplated leaving it with the good panel installed. But as there was only half an hour till lunch time I thought that I might as well continue. I'd been at it all morning, and might as well get some satisfaction by tracing the cause of the problem to component level - and anyway I wasn't going to cheat! I thought it was only going to be the i.f. chip. How wrong can you be? Replacing it made no difference, but use of freezer and the heat gun now made the fault come and go. Its cause was finally traced to the electrolytic capacitor C35 (1g) in the a.g.c. feed to the SL1432 i.f. preamplifier chip. A replacement sent me off to lunch with a beaming smile. S.C. Panasonic TC21R1 (Alpha 2 Chassis) The reported fault was no picture. E.H.T. was present but there was no raster. When the first anode voltage was increased I saw that the cause of the symptoms was field collapse. A new field output chip made no difference and its supply was intact. Now the first thing to suspect with a faulty Panasonic set, once the obvious items have been ruled 438 TELEVISION APRIL 1993

53 CI MP NENTS For TV * Video Audio * Corn a uter IC SELECTION AN5753 C368 TA7240AP TA7256P 4.49 AN TA7273P 454 AY38912/P TA7298P 3.59 BA4236L C3.92 TA BA TA7688BP BA TA CA74ICE 0029 TA CDP6818AE Cf4X62A rass TBA800 C0.99 CNY TBA810P 1.16 DS1488N 0.85 TBA810S 1.62 DS75150N E L 1 50 DS75154N C185 TCA HIIL3 E2.813 TCA940 C3.33 HA1137W 3.61 TDA1001B C E509 TDA1020 C d.75 TDA10357 C2.59 HA TDA FIRFAXkSP E15.18 TDAI KIA7217AP 2.47 TDA1193P E3.49 LA TDA LA3160 C228 TDA1908A C2.06 LA3361 1/9 1DA2003 C2.44 L TDA LA TDA LA LA TDA4420 C271 LM LM733CN LM M54544L 3.38 TDA4950 C2 15 M54548L E529 TDA7350 E521 M54567P E C3.49 MARrin49H 0517 TDA N C2.45 TEA MP TL MSM6242B C11.77 TMS4532NL4 C2.3 MC UM MC14502BCP MEA U148272A NE555CDP UPC C2 UPC1378H C2.45 PC713V UPC1397C C , C15613 Dr.83( STK X.8400APS C4.63 STK5451 C E794 STK STR C TA7226P IC PROTECTORS IF or N Ranges) each E0.79 TOOLS & ACCESSORIES UNIROSr= in Rase Chers:r AMA 'Also PP3 at ralb C.549 UNIROSS C' Necod Battery C209 ) Campng Tool Junta Hacksaw CO 85 5rn Telephone Extension Lead C3 75 BT Ptug-n Tone Ringer well LED pore Telephone Cable poem 0 '3 SE THIS IS JUST A SMALL SAMPLE OF STOCK We can supply spares for many makes of eqmprnent WRITE sia.e. please) or PHONE FOR A 'PRICE 8 AVA/LABIUTY on your requirement COMPUTER SPARES AMSTRAD SINCLAIR Cer Capacrtr r (v f 1 85 C 4fC64 ROM l,,, Print a r Armature Membrane (Spyann, 48K - (PCW 9512) fa 20 Rubber Keys) f 5 33 User Manual (CPCA64) bass Se, Manual (PCVV9512) cm 99, 6.52,5,,,, COMMODORE 1222 ATARI C 6569 VC (Sp 1780,) (1995 IC DMA 1ST) 3324 C 8565 VC IC CO24947 (X&L) 458 C DRAM M THERMISTOR ISTPSL8 f 1 37 IC PLA Sery Men,/ (ST5X,1040) WW1 0 r f PHILIPS San, Manual (C6AC64C) 1499 Sere Manual 8M User Manual (C Se. h&engm983314k I) 871 XTAL MIL, f 4 99 Phips pans available - plus selected Acorn. Alan. Sicker 8 &he. TRANSISTORS SK C I 59 BUV TV/MONITOR LINE OUTPUT TRANSFORMERS ATARI SM COMMODORE I084-PSP etc. P OA PHILIPS Cmec33eCM13833 etc. E22 75 PHIUPSCM11342/ Ferguson 7X93 14'90` Ferguson DOW 20.90' E22 25 Ferguson ' C20 91 Ferguson TX100 51crn FST C18.25 SO89X3XCHiggf Ito /C2294H C tachi CPT1461CPT C2299 Heals CPT2036,467678CP OPT Mitsui / Sash CT141/141X/142R C22 25 Many over Line OR Trenskinners evaliene. AUDIO SPARES AMSTRAD MX200CDX400 (FU6/49 CASSETTE DOOR each C3 64 PHILIPS CST427 SERVICE MANUAL C4 50 SHARP RGF278, MAIN BELT TOSHIBA STU2/1. MA/NS TRANSFORMER TV SPARES AMSTRAD TVF12 SERVICE MANUAL 1739 PHILIPS Deg. POSISTOR (WNW) CI 34 GOLDSTAR CIS4361/4441/CIT2182X21720 NOR SWITCH E6 49 SAMSUNG CI537V1CX593WT On011 SWITCH 605 VIDEO SPARES SHARP VC381/385NC11303 CAPSTAN MOTOR C34 99 Large range al Vole Heeds. knees, Bee 199. Pinch Adore from stock - plus much, much more. Please contact Is. We also ecck REMOTE CONTROLS Many General Component We are pleased to serve both the Trade and End User. DO NOT ADD VAT TO THE PRICES SHOWN - BUT PLEASE ADD 1.20 P&P All items subject to availability - Prices can change without notice. ORDER BY POST OR PHONE MARAPET (TVD) We by VISA cm Access, Payment IMM 1 HORNBEAM MEWS DELTA, svarai, VISA Cheque or P.O.,1111=11 GLOUCESTER GL2 OUE - TV WHOLESALE whew' C3 49 Cl TV TUBES SPECIAL OFFER RE -GUN FST SICM A5I-EAL, ASI-JAR, ASI-EAM ET CARR/VAT. LIMITED PERIOD ONLY STOCKS AVAILABLE A WIDE RANGE OF OTHER TYPES AVAILABLE OUTSTANDING QUALITY FROM ONE OF THE UK's LARGEST BSI APPROVED MANUFACTURERS OF RE -GUN TUBES VISTA ELECTRONICS VISA Unit 1B, Wingate Grange Industrial Estate, County Durham, TS28 5AH Tel: Fax: SONY TUBES RE PROCESSED WITH ORIGINAL SONY GUNS HIGH TEMPERATURE RE -PROCESSING of Sony, Mullard 45AX, 30AX, In -line, PiL, Mini (22.5) Neck and FST Tubes B KRB LHB EFB22 ( YUB S822 Sony EGB22 Hitachi DY HB22 Sony DB22 Sony E822 Sony A51-231X ITT A51-570X Mullard F Mullard A Mullard A Mullard A56-701X ITT A66-540X Mullard A I it A34EACOOX A34JBU1OX Sony A44JEX1OX Sony A44JFZ1OX Sony A49JHT00X Sony A49JLY10X Surly A51EALOOX A51EBSOOX A51JAROOX A51JKO00X Sony A51JUHIOX Sony C74.00 A53JBW00X Sony C64.00 A59JIAZ40X A59EAKOO9 Philips C64.03 A64.1KJ10X Sony A66EAFOOX A66EAK00X Philips AE8JMT1OX Sony A68JYKI0X Sony C95.00 AXM C48.00 AXT C44.00 AXM5I AXT PROMAX CRT RESTORERS RT-501B / TA -903 ELECTRONIC TEST EQUIPMENT For tube types not listed please enquire All Tubes Guaranteed 12 Months All prices quoted are excluding VAT Exchange CRT is required Callers welcome Please phone first. Delivery Available NEW TUBES IN STOCK - PLEASE PHONE FOR YOUR REQUIREMENTS Very competitive, nationwide delivery and collection service D.I.Y. Television Tube Polishing Kit Contains everythirg you reed to Polish scratches and small chips or. your CRT screens All you require is an electric drill Written instructions are provided Guaranteed to work. Worldwide Delivery Total Price includes P&P and VAT Available from Luton only Your local stockist are: WEST ONE WELL VIEW WELL VIEW Distributors Ltd Midland Road. Chesham. Bucks. Luton. Beds. U.K. LU2 OBL. Southampton. Hants. Tel Tel Tel The most popular range of workshop and field service CRT restorers now awailable in England. Designed for the measurement, analysis and regeneration of all commercial monochrome and colour picture tubes. Nineteen sockets and referrence list avaiable. For TV service si S ialists ALBAN ELECTRONICS LIMITED 4U St Albans Enterprise Centre, Long Spring Porters Wood, St Albans, Herts., AL3 een Tcl: Fax: TELEVISION APRIL

54 out, is a defective lonf ceramic capacitor. I looked at the circuit diagram and the first one I came across was C403, which is connected to pin 2 of the TDA2579 timebase generator chip. A check showed that it read just over 100Q in circuit. When a new one had been fitted we had full field scanning. If I had a pound for every 1 OnF ceramic capacitor I've replaced I'b be laughing. S.C. Philips 2A Chassis This set ticked quite noticeably in standby. Everything else was perfect, but the ticking wouldn't go. I was convinced that the cause of the trouble was in the power supply, and after a long and finally rewarding search the culprit turned out to be C2690. It's a 11.1F, 100V non -polarised capacitor that's connected between the earthy side of the chopper driver transistors and the non -isolated chassis. S.C. Mitsubishi CT21M 1BM The red LED was illuminated but apart from that the set wouldn't come on at all. I removed the back with some trepidation, being rather a novice when it comes to Mitsubishi sets. Fortunately the power supply looked to be reasonable and conventional. After checking the output voltages it seemed that the cause of the problem was absence of the 12V supply. This comes from a l2v regulator, and I soon found that there was an input to this device but no output. The standby control line acts on this regulator, and I thought I'd try my luck here. This line leaves the power supply and goes directly to the POW pin of the microcontroller chip IC701. After probing around in this area with the meter I found that the set would kick up. Dry -joint time, it seemed. The legs of crystals are usually a favourite, whether it be a remote control unit, a Nicam panel or a microcontroller chip. Sure enough both legs of the 4MHz crystal CF701, which is connected to pins 28 and 29 of IC701, were dry -jointed. Resoldering them provided a speedy cure, thankfully. S.C. Toshiba 2512DBT The reported fault was of whistling Nicam reception. In fact Nicam reception was pretty dire, with crackling and popping in addition to a permanent high-pitched whistle. As expected, the f.m. sound was perfect. By chance I noticed that moving the scan coil flylead or the Nicam signal leads aggravated or alleviated the problem. It transpired that the line scan current was interfering with the digital data signal going to the Nicam panel. Redressing both sets of leads completely solved the problem. S.C. Grundig CUC2410 Chassis This set was dead: the power supply would try to start, but with little success. After a cold check on all relevant resistors and fitting a new TDA4600 chopper control chip we eventually traced the cause of the fault to C633 (100g, 25V) which was open -circuit. A.D. Matsui 2890/Saisho CM2880TX There was field collapse, the white line being very bright indeed. Had this additional factor registered with us time wouldn't have been wasted looking for a fault in the field output stage. The cause of the fault was in the video output supply, where D406 was short-circuit and the series safety resistor R440 was open -circuit. A.D. Hitachi G8Q Chassis There was an intermittent start-up fault with this set. When cold it would sometimes come on only in standby. But if the mains switch was held the set would eventually come on correctly. The cause of the fault was traced to the start-up thermistor TH902. A.D. Amstrad TVR2 Several of these sets have come in either dead or intermittently dead. In just about every case the cause has been that C1507 (1µF, 50V) was either leaky or open -circuit. An exception came in the other day. Although the job ticket said that the set was dead it wasn't the ljtf capacitor. The cause of the problem was that the mains relay wasn't being energised because there was no 5V output from the power supply. In fact the fault had nothing to do with the TV side of the combination: a fuse in the VCR section had blown. A.D. Supra STV1401R This colour portable was dead. There was 350V at the input to the STR5412 regulator chip IC104 but no output at pins 2 and 4. Replacing this item restored normal operation. G.F. Saisho CT142RX There was an intermittent fault with this set. The picture would go very dark, with very prominent colour. It was as though the luminance delay line was open -circuit. Additional symptoms were a three-inch vertical band, predominantly red, and faint flyback lines. We found that the tube base panel was very sensitive to being touched. The cause of the trouble was poor joints on three of the pins of the ribbon cable that goes to connector plug/socket CD803. G.F. Hinari TVA1 After the initial start-up this set was very intermittent/temperamental about coming out of standby. Just about everything in the power supply seemed to be sensitive to heating/freezing, including the relay. The fault cleared when a new STR5412 chip was fitted. G.F. Matsui CTV2055 There was an over -bright picture with flyback lines. When the first anode and brightness settings were reduced there was shading from the left-hand side of the screen. We found that the h.t. supply to the RGB output stages was low at only 113V instead of 190V. The reservoir capacitor C120 (4.7µF, 350V) was open -circuit. Incidentally this set is a Fidelity clone. G.F. Bush 2020 This set suffered from an intermittent fault. There would sometimes be a blank screen, but on occasions this would have a thin red line across it, as if there was field collapse. The fault was so intermittent that it could take anything from minutes to weeks for it to recur. We found that touching the board almost anywhere when the set was warm would produce the fault, which was thus very difficult to localise. Eventually we found a bad joint on C307, which is partially hidden by a plastic support strut. G.F. 440 TELEVISION APRIL1993

55 K 4.50 AN3310K 2.95 AN3312 F2.95 AN3320K 4.95 AN3331K 5.75 AN3792 F2.95 AN382IK 6.95 AN3822K 5.95 AN3830K 6.50 AN AN AN A/ AN5135K 3.95 AN AN AN5256 C C F2.20 AN AN5521 E2.20 AN5560 6,95 AN5610N AN AN N C AN AN AN AN AN AN6250 C1.50 AN AN AN6320 E2.95 AN AN AN6337 E3.95 AN6340 E3.75 AN6342N 2.50 AN AN AN AN AN AN AN A/ AN AN6671K AN AN7106K AN AN AN7161N 3.50 AN7161 NEP F2.95 AN AN7171K 4.75 AN7172K K 6.50 AN AN AN BA6302A C BA7751AL 1.95 HA HA RA C2.20 RA C E FIA11223W RA RA RA H RA11747ANT 7.50 RA RA E NT 6.25 RA HA12047 E3.50 HA H H H V C1.75 KA KA KA LA L I LA LA LA LA LA LA I LA LA3210 LA3370 LA3375 LA3376 LA4108 LA4137 LA4145 LA4160 LA4162 LA4170 LA4182 LA4183 LA4190 LA4192 LA4260 LA4261 LA4265 LA4270 LA4280 LA4282 LA4440 LA4445 LA4446 LA4460 IA4461 LA4465 LA4466 LA4475 LA4476 LA4495 LA4498 LA4500 LA4505 LA4508 LA LA7031 LA7032 LA7033 LA7035 LA7042 LA7223 LA7224 LA7520 LA7755 LA7800 L07801 LA7806 LA7808 LA7910 LB1403 L L LC7132 LC7137 LC M M52187 M M M M M51397AP M M M F E E E2.50 E2.20 C C U C E E E1.50 M63730 MB3731 M SAA5030 SAA5042 STA3015 STA401A STA441C STK0029 STK0039 STK0040 STK0049 STK433 STK435 STK437 STK443 STK457 STK459 STK463 STK465 STK STK1060 STK STK2028 STK2029 STK2038ii STK2048ii STK2125 STK K2139 STK K2230 STK2240 STK2250 STK STK3044 STK3062 STK3082ii STK3102itt STK3152iii STK4017 STK i STK4122it STK41314 STK41321i STK4141ii STK4141v STK41421 STK41511i STK STK416Iii STK STK4172ii STK4181il STK4191ii STK4192ii STK4332 STK4352 STK4793TV STK4803 STK4833 STK4843 STK4853 STK5315 STK5324 STK5325 STK E F E E E E E E E E STK TA727A/AP STK TA7280P STK TA7281P STK STK TA73177 STK TA7607AP STK TA7609P STKAI TA7611AP STK TA76287 STK TA7640AP STK STK STK ST STK STK F12.50 STR STR STR STR456A 825 STR TR1229 MOO STRI31806E 0.20 STRD1816E 0.20 STR STR STR STR STR STR STR STR STR5015 E5.20 STR54 i2 E5.20 STR ST STR STR STR STR STR STR30130 E5.25 STR STR ST STR STR STR STR STR STR STR STR AP TA TA AP TA7241AP TA7243P T TA E C E E C2.50 6_ TDA TDA TDA1170N 1.50 TDA1170S 1.50 TDA TDA1510S1 E3.95 TDA1515A TDA TDA1770A TDA TDA TDA TDA TDA2005M C2.50 TOA2005S TDA TDA2578A 2.50 I TDA2579A TDA2653A TDA TDA TD03562A 4.50 I TDA TDA TDA TDA TDA F C A C C P TEA E TEA UPC575C 1.00 UPC1025H 2.30 UPC1185H 1.75 UPC1191V 1.20 UPC119IC C1.60 UPC1230H UPC123: UPC UPC1263C UPCI277H 1.50 UPC1273H 2.50 UPC1319AU C2.75 UPC1335V F2.75 UPC1353C UPC1364C 4.20 UPC1365C UPC1333H 1.20 UPC1387C 1.95 UPC1391H 1.50 UPCI4113CA 1.75 UPC142OCA 6.20 B B0140 E C 0950 E10244C E B E B BOT B R TY EI1Y87.100R 1.75 E BU BU BU E C A F El F1.29 BU BUTI 1M 6.30 TIF410 E035 TIP42C 6.35 zr0e , B , SB E SC ; 25C C1946A C C2166 2SC SC E0 25C SC SCA ' S E '427 2SD' , ,887 E E2.50 E F F E C C E E F E F C2 20 Li T. POWELL 15 PADDINGTON GREEN, LONDON W2 1LG Tel: Fax: VIDEO HEADS AMSTRAD / AMSTRAD VCR HITACHI VT11/14/ HITACHI VT8000/ HITACHI VT7/17/ HITACHI VT35/ JVC/FERGUSON PV 31332G JVC/FERGUSON PV 31332L 2940 JVC/FERGUSON HRD 180/23013V JVC/FERGUSON HRD 725/755/3V43/3V JVC/FERGUSON HRD JVC/FERGUSON HRD 7655/3V32/ MITSUBISHI HS 303/304/310/320/ PANASONIC VEH PANASONIC VEH PANASONIC VEH PANASONIC VEH PANASONIC VEH PANASONIC VEH PANASONIC VEH 0174 (original) PANASONIC VEH PANASONIC VEH 0267 (original) PANASONIC VEH PANASONIC VEH 0252 PANSONIC VEH 0252 (original) SAMSUNG Most Models SANYO VHR SANYO VHR 3100/3200 SHARP VC 6300/7300 original (BRASS) SONY DSR 35 El-2E N SONY DSR TOSHIBA V31/33/ TOSHIBA V71/ EEC CUSTOMERS If VAT regered, zero rale stel applies bt m supply VATtst No NOT VAT registered 1 u at 7 5% VAT Is payable on total Order C.W 12-C.C.W CASSETTE MOTORS CASSETTE HEADS Mono 1.20 Stereo 1.80 Auto Rev 2.75 ITEMS DISPATCHED WITHIN 48 HOURS Please add 80p post and packing and then add 171/2,, VAT to total. Callers by appointment Opening times 10am-5pm Mon -Fri Sets. VISA/ACCESS ACCEPTED MIN. - TELEPHONE ORDERS 5.00 WE HAVE THE WIDEST CHOKE OF USED OSCILLOSCOPES IN THE COUNTRY 7IICTliOAAX 7000 SERIES OSCILLOSCOPES Dual Trace Plug -n wth TB from (200 many Pug -o oppons available 4 traces. CsIferental etc Hug rns sod separately TEKTRONIX 2336 Dua Trace I 00MH3 [let a,' Sweep used PHILIPS 3070 Dual 1 race I OMNI Defy Sweep Ina Vew Clever Cursor's Loquod Crystal &PLO. L900 HITACHI 01050F Dual Trace ,1 18 veth 4 Channel Mode LISS SCHLUMBERGER 5218 Dual 1race 200MHZ Deb, Sweep with Tng she., 475 TEKTRONIX 4650 Dual Trace 100MHZ Delay Sweep MO 1101RONIX 465 Dual Trace 100MHZ Delay Sweep [450 IsAMEG 1005 I note Trace 100MHZ Delay 7 enebase 1525 P 1740A Llual Tr ace 100M HZ Deay Sweep TIKTRONIX 2225 Dual (race Z Alternate 111 Magnika [450 PHILIPS RM3217 Dual Trace 50MHZ De., Sweep 1400 HITACHI 0650F Dua. Trace 60MHZ Delay Sweep [400 ITLLQUIPMENT 083 Dual Trace 50MHZ Delay Sweep [2110 KKIJSUI 5530 a4 trace 30MHZ [RN,-OULD Dual Trace Z [1114 GOUL D Dual Trace 20MHZ 1200 GOULD 052S013 Dual Trace I SMHZ [125 /HS IS/UST A SAMPLE - MANY ()flit 125 AVAILABLE PHILIPS PM5193 Programrnabie Synthesherhunct.or Gene, or 1E !MHZ-SOM.-13 [ ' MARCONI 2019 Syntaxyzed AMFM S,g Gen 80KHZ -!040MHZ [2000 MARCONI 2018 Synthewed AMAM Srg Ger. 80KHZ - 520MHZ [150 MARCONI 2107 Stable. Loy. nose AM/FM Skg 1024MHZ GP1Fs [2000 MKrOwas, Frebue,cy Gov,- - LINO Amok, 351D MKrowave F./ LIP 8GHZ [950 HP 339A Ustoroon Measurrng L1500 Set1. RACALDANA 1991 Nanosecond 110.-ersa sy`th. C000 RACAL 9302 RE MIkyoltmeter True R HZ L450 RAC.N. 9301A RF Mreyoftmeter 1 tue 9115 I(11:H! Sr, I-100 RACAL 9009 Automatic Mob Meter 1311TT. Dehabon L150 H P Rube Generator type 2148 L050 LYONS PG73N Puke Gen PRE IHZ 2061e2 ISO MARCONI 2610 I rue HMS Voltmeter GOULD Poornabon Loge Analyser KEIT HLEY 224 Programmable Current Source SPECTRUM ANALYSERS I -1P.411 eetts 8S5SA 81F plug n 10MHZ 18GHZ HP 14I I w th kHZ 12S01mHZ HP 1401 wth & 8552A SOOKHZ 1250M1-11 HP 141 T wth EISS6A & HZ 300KHZ HP 1401 wan 8553L & 8552A IKHZ I lomhz HP 1821 wth I 00HZ- 1500MHZ MARCONI TF 2370 IKHZ.I OMHZ L000 L500 (1000 [IMO [1300 [1010 [ION [11110 [1500 [1500 DA T RON /2 cleat Autchal DC Multmeter vhth True F1615 AOReustance/CLrrent [1750 DAT RON 1061A dge Autoca. MO6meter wall I,pe RMS ACCur.rent [1150 DA 1 RON /2 dr AU10(.4. Mulumeter. ACDOOters whn IEEE GAO HEwL1 17 PACKARD Bench Motesseler 5 dor ACCX-. Ohms PHILIPS PM2534 Multi Funcbon Dr -II 31/201/2 die with GLIB IEEE L454 MAROS:45110,gal h-expecy Meter 2430A 104Z-801HZ LI ZS MARCONI Dgrtal Frequency Meter I0H2-2CCMHZ L150 MARCONI Urvversal Caester Tyner 2437 CC- I 00MHZ (175 MARCONI Sinners, Counter Tuner 2438 OC520MHZ [225 HP33 IA Furcuor General, 0 IHZ-IMHZ Seerargrei 1125 MULTIME TER Handheld. M range-. AC/DC 10Amps Dtode/Tranbstor Test, Freg Counter rearnell Electronh Load /04 30Arnp 35 Von 1400 RACAL DANA RE Power Meer RACAUDANA 9341 Databrdge Automate LCR8O LISO WA YNE KERR 0424 RC L Meter LCD Casper [125 wayne KL RR 4210 LCR Meter Accvacv AVO AC/DC Breakdown Leakage & s -e -515r,,T AVO VALVE Characters. Mete,, L300 I ELEQOPMENT C171 Curse Trash, (2.50 MARCONI Unyersa.LCR &Inge Battery from [ISO FARNELL PSU 70V SAXE/ ICA type TWOb5t2 Meteees FARNELL PSU 60V 25A Metered type H FARNELL PSU 30V 5A. Metered type L30( LBO FARNELL SSG 520 Synthevsed Srs Gen I 0-520MHZ L400 FARNELL Transmber lest Set consistng LA L. Al Counter RF Mod Meter. RF Power Meter. AF Voltmeter Dstortkon Meter. AF Synthesher L400 SLY D as a Parr lot ONLY [750 NEW EQUIPMENT HAMEG OSCILLOSCOPE HM 005 7,pe Trace , 1Feby I,mebase AMEG OS( 1LLOSCOPE HM604 Dug I rare 00614, L T4.1a, L653 HAMEG OSCILLOSCOPE HM203 7 OF, prnponent L342 HAMEG OS( istoscopl e1112cs 3 Dmal 1 race PiTelerz L/11 AP otter wevels askulabie - al oscirscous suppled w0..2 prates BLACK STAR EQUIPMENT (P&P all units KS) APOLLO III z Conte, T rner RaterPenodritike oteryal etc [222 APOLLO trAs above wrti more Ise(uork) LIU METEOR 102 ISSLQUENCY COUNTER I 00Mbla [10/ ME FREQUENCY COON ' ER 6COMHz (135 METEOR 1000 FREQUENCY COUNTER I GHz rufstor sat Risk-PON GEN 0 IF/ S004tr rev, ORION COLOUR BAR GENERATOR ParIVNdeo (170 (110 [221 All other Black Sur Foul:or-rent available OSCILLOSCOPE PROBES Swscl-able x I x 10 (P&P (31 Used Lchepenent - Chavanteed Manuah supplied 4 posvbile 1 ha h a VERY SMALL SAMPLE OF Sr OCK SAL or,eiephone for m Please check avariabley before ordering CARRIAGE all (16 VA7 to be added to Total of Goods and Carriage STEWART of READING 110 WYKEHAM ROAD. READING, BERKS RG6 I PL Telephone: ) Fax: (0734) 35 I 696 Callers Welcome 9am-5 30pm Mon -Fri (untll 8pm Thurs) 5044 P R 0 MAX ELECTRONIC TEST EQUIPMENT TV & SATELLITE LEVEL METER MC -260 FM radio, TV and satellite all in one instrument Frequency counter for setting satellite channel Autocorrected level reading across all bands High accuracy without the use of correction charts Stable 12,15 & 18 volt LNB supply Many system fault finding functions For TV/FM, SAT TV, SMATV and Cable TV installers ALBAN ELECTRONICS LIMITED 4U St Albans Enterprise Centre, Long Spring Porters Wood, St Albans, Herts., AL3 6EN Tel: Fax: TELEVISION APRIL

56 The Universal Transistor Gene Turnbull Even though conventional transistors have largely been ousted by integrated circuits there are more types - though fewer of each - in use than ever before. To reduce stockholdings, by both manufacturers and the service industry, research is being carried out by a Korean company, Taegu Semiconductor Inc., on a single device to replace all those in current use. The most promising prototype has been given the development number UR1, and the aim is that it should be a workable substitute for both npn and pnp transistors in applications ranging from switch -mode power supplies to s.h.f. front -ends, taking in timebase, audio and logic switching roles. The device currently being tested has two bases, one for pnp configuration and the second for npn operation. The unused base is connected to the collector for an hfe (gain) of 40 and to the emitter for an hfe of 200, thus covering the tolerance spread of most transistors. Other characteristics of the device are Vcbo 1,400V, Ic 5A and fr (typical) 14GHz. Production transistors will be supplied with optional mounting kits, one of which adapts the device for surface mounting where this is required. Another one consists of a TO3 bracket, for use in place of BU208 and similar power transistors. A heatsink is required for high -power applications like these, but not for use in place of devices such as BC171s or BFQ33s. It has been calculated that high -power applications will account for less than half of the universal transistors used so, like the mounting kit, the heatsink will be marketed as an optional extra. Price is of paramount importance with this type of product. If world sales reach the expected level, it's hoped that a trade price of 1.49 (UK equivalent) can be achieved. At this level Taegu Semiconductor expects to attract orders from all the major setmakers as well as service and repair shops in Europe, the Far East and America. A spokesman for the company claimed that the saving in stockholding, data books and equivalents lists would run to millions of dollars annually in the USA alone. Taegu has several similar projects on hand in its research laboratories. One is a range of semiconductor -based replacement modules for thermionic valves, using high -voltage power f.e.t. technology. Each package will be similar in shape and size to the valve it replaces, with identical plug-in base connections. KT66 and 6V6G types are expected to find a large market amongst valve amplifier enthusiasts. who will be able to get the "valve -sound" characteristic they like without the risk of breakage or the need to pay for cathode heating power in an increasingly energy -conscious world. Other advantages of solid -valve technology are greater reliability, lower price and ready availability from Korea. Many conventional valve types are scarce and difficult to obtain now. The EF86, a low -noise audio preamplifier, is a typical example. Its solid-state equivalent, the SEF86, will use spin-off technology from the UR1 universal replacement transistor described above. Also under development, but not yet available even in prototype form, is a universal integrated circuit. For economic and logistic reasons, it's unlikely that this will be designed as a replacement for all i.c.s - it's too difficult to price a chip that can act as either a simple quad -inverter or a VCR system -control microcomputer. If and when the device becomes available, it's most likely to be in the form of a 4 - bit programmable microcontroller with a minimum of 100 pins. Not all applications will require use of all these pins, nor all four bits, especially as the CPUs used in domestic electronic gear generally work with serial control bus lines like the I2C. Here the spare pins are used to configure the i.c. as required, for control of a washing machine, a VHS VCR, an edit controller or a remote control gun for example. One of the most difficult aspects of the design of an i.c. like this is the arrangement of the lead -out pins and assigning it a type number. Apart from the i.c. device, for which no production date has been quoted, the products are expected to come on stream at the beginning of the second quarter of next year. Distribution in the UK and Europe is likely to be in the hands of a Scandinavian company, Luflirpa, that will set up a network of agents and wholesalers. ANSWER TO TEST CASE SEE PAGE Two questions were posed at the end of this month's puzzle. Their answers are no, it wouldn't have been a wise move to replace the troublesome Hitachi VT430 VCR's capstan motor, and yes a replacement motor would have cured the problem! How can we reconcile these two answers? Well, no sooner had Real Technician got the capstan motor out of the machine and gone to the component storage racks to look for a replacement than coffee break time came around and Television Ted, who also knows a thing or three about video machines, joined RT for a breather. On hearing about the faulty motor Ted asked to see the body before it was committed to the dustbin. When he turned the rotor he found that it was as stiff as a rusty winch! When the motor's rotor and stator were separated the upper bearing surfaces were found to be covered with a dry, black substance that looked like hardened grease. A fibre pencil and a rag soaked in solvent were used to remove it from the shaft, while a solvent -saturated cotton bud on a stick was used to clean it off the sleeve. The bottom bearing seemed to be unaffected but was similarly cleaned. Both bearings were given a tiny dose of lubricant. When the serviced motor was refitted the machine's performance was transformed. All functions worked properly and the motor ran cool. Why is it that some VCR makes and models suffer from this problem while others are completely free of it, though all of them have a barrier ring just above the upper bearing to prevent the ingress of dirt? Published on the third Wednesday of each month by Reed Business Publishing Ltd, Quadrant House, The Quadrant, Sutton, Surrey SM2 5AS. Filmsetting by Marlin Graphics, 2-4 Powerscroft Road, Sidcup, Kent DA14 5DT. Printed in England by BPCC Magazines Division, Carlisle Web Offset, Cumbria. Distributed by IPC Marketforce, Kings Reach Tower, Stamford Street, London SE1 9LS ( ). Sole Agents for Australia and New Zealand - Gordon and Gotch (Asia) Ltd., South Africa - Central News Agency Ltd. "Television " is sold subject to the following conditions, namely that it shall not, without the written consent of the Publishers first having been given, be lent, resold, hired out or otherwise disposed by way of Trade at more than the recommended selling price shown on the cover, excluding Eire where the selling price is subject to currency exchange fluctuations and VAT, and that it shall not be lent, resold, hired or otherwise disposed of in a mutilated condition or in any unauthorised cover by way of Trade or affixed to or as part of any publication or advertising, literary or pictorial matter whatsoever. ISSN X. 442 TELEVISION APRIL 1993

57 CentreVision SLOPER ROAD LECKWITH CARDIFF EX33 M4 TELEPHONE COME AND LOOK AROUND THE LARGEST TV & VIDEO WHOLESALER IN SOUTH WALES ******** ***** *** ******** PLENTY OF WORKING Ws ON DISPLAY READY FOR DIRECT RESALE TEST BENCH AVAILABLE ***** *********** ******** WHY WASTE YOUR MONEY ON NEW SPARES WHEN WE HAVE SECONDHAND NEW SUPPLY NEW SUPPLY NEW SUPPLY CALVARY ENGINEERING Ex -Rental TV & Video A) OFF THE PILE: Direct from rental - guaranteed completely unengineered * B) WORKING: Soak -tested (A) (B) Basic non Thorn TVs from Ferguson Basics from Ferguson R/C from Ferguson TxT from Ferguson Stereo Text from FST TVs from Top loading VCRs from Front loading VCR's from All prices plus VAT Delivery Arranged CENTREVISION NEW AND USED HANDSETS EXPORT ENQUIRIES WELCOME only the coin meters have been removed PHONE DAVE ON BANBURY (0295) FOR ALL DETAILS REPO TV FOR YOUR GRANADA TV & VIDEO REQUUIREMENTS NEW STOCK WEEKLY FROM OUR NEW DEPOT UNTESTED -AS THEY ARRIVE OR TESTED & WORKING ALSO STILL SUPPLYING THE BEST SERVICED M.D. SOURCED STOCK REPOSSESSED TV CENTRES LTD DAISY WORKS STOCKPORT ROAD LONGSIGHT- MANCHESTER M13 OLF ALMOST OPPOSITE MAIN POLICE STATION A TO Z (MANCHESTER) D1/ /FAX ACCESS - VISA - CHEQUE - SWITCH - CASH P ROMAX ELECTRONIC TEST EQUIPMENT TV PATTERN GENERATORS GV-310 / GV-498 Up to 32 selectable patterns Video and RF output. Tunable from 37 to 860 MHz 3 1/2 digits frequency counter Text and logotypes (only GV-498) SCART connector For television signal engineers ALBAN ELECTRONICS LIMITED 4U St Albans Enterprise Centre, Long Spring Porters Wood, St Albans, Hens., AL3 6EN Tel: Fax TELEVISION APRIL

58 ' HOW TO INCREASE YOUR PROFITS, IMPROVE YOUR SERVICE, WITH COST EFFECTIVE TEST EQUIPMENT. HAMEG OSCILLOSCOPES B & K PRECISION CRT ANALYSER -RESTORER HAMEG are Europe -s top selling DUAL TRACE OSCILLOSCOPES. Select from four superb models. All, with the exception of the HM incorporate a useful COMPONENT TESTER. Size - all models 285rnm s 145rnm 380mm. Clear display km a 10cm Mains supply. 110/ V AC 50/60Hz. All supplied with 2 PROBES, a COMPREHENSIVE MANUAL and a 2 YEAR WARRANTY. HM MHz STANDARD SPECIFICATION 2 Channels Bandwidth: DC - 20MHz a. Sens: Ch.!, Ch.2, I mv/cm Timebase: 0.1s - 2Ons/cm Triggering: DC - 40MHz Active TV - Sync - Separator Variable hold -off Trigger LED Indicator Calibrator: 1KHz Square wave Component tester Plus many features Price , V.A.T. FREE Specialist Carrier Delivery HM604 60MHz UNIVERSAL SPECIFICATIONS 2 Channels Bandwidth: DC - 60 MHz Sens: Ch.1, Ch.2, I mv/cm Timebase : 2.5s - 5ns/cm Triggering: DC - 80MHz Active TV - Sync - Separator * After delay trigger Sweep delay Delay line Trigger LED indicator Calibrator: 1KHz 8 1MHz Sq. Wave Component tester Price V.A.T. FREE Specialist Carrier Delivery HM MHz UNIVERSAL Price V.A.T. 3 CHANNELS - UP TO 6 TRACES SPECIFICATION 3 Channels Bandwidth: DC - 100MHz Sens: Ch.1, Ch.2, Ch.3, 1mV/cm Timebase A: 2.5s - 5ns/cm Timebase B: 0.2s - 5ns/cm ' Triggering DC - 130MHz After delay trigger Delay line Trigger LED indicator ' Overscan LED indicator Active TV - Sync - Separator Calibrator: 1KHz & 1MHz Sq. Wave FREE Specialist Carrier Delivery HM MHz DIGITAL STORAGE SPECIFICATION Digital Storage Analogue real time (Same as 203-7) Bandwidth: DC - 20MHz ' Sens: Ch.1, Ch.2. lmv/cm Timebase Digital: 5s-1ps/cm Triggering DC - 40MHz ' Active TV - Sync - Sampling Max sampling rate: 2 x 20MHz Memory: 2 x 2048 x 8 Bit Dot joiner Printer/plotter output Price V.A.T. FREE Specialist Carrier Delivery B.K.'s CRT TESTER REJUVENATOR Tests and rejuvenates blue, green and red guns separately. Fitted with delta and P.I.L. sockets. Compact size 120 x 65 x 60mm. Supply 240V AC Price V.A.T. DIGITAL CAPACITANCE METER ' High accuracy ' 0laf-2.000rd. LCD display. 8 ranges. Accuracy /- 0.5%. Full scale /- 1 digit. Inc. protective case. Price V.A.T. LEADER FM STEREO SIGNAL GENERATOR At last! A generator specifically designed for testing and fault finding on FM stereo and monaural VHF receivers including stereo multiplex circuits. FEATURES Carrier frequency 100 /- 1MHz (adjustable). ' Output level 0.1mV 10mV. Pilot signal 19KHz I. 2Hz. L A R separation over 50dB. External Modulation 50Hz - 15KHz. ' Pre -emphasis s. 7Sps 8 off. ' Comprehensive test lead set included. ' Mains powered. Size: 80 x 200 x 250mm. Price BARCLAYCARD VISA V.A.T. LEADER HIGH VOLTAGE METERED EHT PROBE Light weight, easy to -grip high -Impact plastic handle with arc -over protection and rso need of extra equipment. An Indispensible item in your TV service kit. Measures up to 40kV DC with safety and the greatest of ease. Entirely selfcontained. Connect the lead clip to chassis and probe tip to the check point, read the meter for voltage. A must for the Health and Safety at Work Acts. Price V.A.T. U K POST PAID, export enquiries welcome. Visa/Access or cheque with order, payable B. K. Electronics. Official Orders welcome from Govt. Depts., colleges. P.L.C.5 etc. Large (A5) S.A.E. for technical leaflets of complete range. Credit card orders are accepted by 'phone, fax or post. Delivery normally within seven days. The number one CRT Test Instrument. Over 5000 U.K. Television engineers wouldn't be without it. ' All CRT's checked identically, including all in -line and one gun types Tests all three guns of colour CRT's simultaneously under actual operating conditions (model 490) Exclusive multiplex technique Prices Model 490 Tri.dynamic three meter instrument inc. 6 common adaptors... Without adaptors.. Model 480 Single meter instrument inc. 6 common adaptors Without adaptors (model 490) Measure true dynamic beam current that actually passes through G1 aperture to screen Measures all shorts and leaks - preserving more CRT's Tests focus electrodes lead continuity finding faults that other testers miss *Uses most powerful restoration method known with minimum danger to CRT Rejuvenated CRT's guaranteed as new for two years Obsolescence proof - perpetual set up chart updated and new adaptors developed Tests and rejuvenates VDU's and oscilloscope tubes A range of over 40 CRT base adaptors available Increase profit Pays for itself in months. C (89.08 V.A.T C78.05 V.A.T..C [62.63 V.A.T..C t54.25 V.A.T. SADELTA SIGNAL STRENGTH METERS TM Saddens Field Strength Meters have been designed to facilitate the dish alignment of satellite TV systems and aerial alignment of VHF/UHF television and radio systems. Signal levels can be accurately measured on the TC402-C and the TC90, allowing the evaluation of signal conditions for satisfactory operation. Both models have a clear LCD direct frequency readout, coupled to a multiturn tuning control enabling precise channel identification. TC4O2-C VHF & UHF FEATURES 'Three bands: Low VHF: MHz High VHF: MHz UHF MHz Digital display for direct frequency readout. ' Built-in monitor loudspeaker AM:FM. ' Signal measurement from 20, V to 100mV. Powered by eight 1.5 AA batteries. Fully portable with sturdy carrying case. Price t V.A.T. Price t V.A.T. TC9O VHF -UHF- SAT. FEATURES Five bands: Low VHF : MHz High VHF MHz Hyper VHF MHz VHF MHz Satellite : MHz. Digital display for direct frequency readout. ' Signal measurement VHF/UHF 20pV to 3V. Signal measurement satellite -70dBm to -10dBm. Audible indication of satellite signal level. Built -in -monitor loudspeaker AM/FM (not satellite). Powered by rechargable battery (complete with charger 220/240V AC). ' Fully portable with sturdy carry case. BLACK STAR COLOUR PATTERN GENERATOR THE 'ORION' THREE -IN -ONE PAL VHF/UHF - PAL VIDEO COMPOSITE - R.G.B. The Orion is a compact, bench instrument offering a wide range of patterns and facilities at a truly low cost. In addition to a switchable sound carrier facility which allows use with the majority of PAL TV systems, the Orion provides highly flexible RGB outputs. ensuring compatibility with most video monitors. More than 50 pattern combinations can be selected. including those for testing static and dynamic divergence, video amplifier linearity, colour purity. general colour performance, locus etc. A separate video input to modulate camera signals; fully variable RF and video output levels facilitating AGC testing; trigger output allowing easy triggering of difficult oscilloscope waveforms; external sound modulation input via DIN connector for frequency response testing of TV sound systems; adjustable wide frequency coverage of VHF and UHF TV bands. Just some of the features making the Orion Pattern Generator an indispensible tool in the manufacture, test, and servicing of televisions, and computer and video monitors. FEATURES Colour bars, purity, greyscale. crooshatch, dots, focus, etc. VHF/UHF Channels. ' 5.5MHz, 6.0MHz, 6.5MHz Sound Carriers Internal/External Sound. External Video Output. Trigger Output. PAL B,D.G,H,I,K. Separate R. G, B and sync. 0/P's. *RGB a TTL 8 1V. ' Green - 0.3V Syncs. Composite Video Output. Variable RF/Video Output. Swltchable Video Polarity. * Mains powered 220/240V AC 50/60Hz. Size: 9' 219 x 240mm. Price V.A.T. UNITS 1 & 5 COMET WAY.SOUTHEND-ON-SEA ESSEX SS2 6TR Tel.: Fax.: TELEVISION APRIL 1993

59 The Euras System is the largest repair tips database for CD, TV and video in Europe. PROMAX TV/FM LEVEL METER MC -477D ELECTRONIC TEST EQUIPMENT Solutions at your fingertips. The System has over 100,000 repair tips for 10,000 models from 250 manufacturers and is conveniently available as manuals, stand alone PC or videotext. The System now also boasts technical service data for computers from SAMS Computerfacts, available as manuals. Euras International Limited Heston House, 7-9 Emery Rd Brislington, Bristol BS4 5PF England Telephone Fax Frequency range: MHz Functions: TV, spectrum, analysis, synchronism Simultaneous display of picture and measured level 39 memory channels, set by user Auzocorrected meter reading for higher accuracy For TV/FM, SAT TV, SMATV and Cable TV installers ALBAN ELECTRONICS LIMITED 4U St Albans Enterprise Centre, Long Spring Porters Wood, St Albans, Herts., AL3 6EN Tel: Fax: PROMAX ELECTRONIC TEST EQUIPMENT FM & TV FIELD STRENGTH METER MC -160B Excellent for aerial installation Frequency coverage 48 to 856 MHz Accurate digital frequency display Measurement accuracy ± 2.7 db Superb sensitivity for FM and TV Easy to buy, easy to carry For FMITV, MAW, CCTV and Cable TV installers ALBAN ELECTRONICS LIMITED 4U St Albans Enterprise Centre, Long Spring Porters Wood, St Albans, Herts., AL3 6EN Tel: Fax: TELEVISION APRIL

60 TUBES TUBES WHERE CAN YOU BUY 65,000 DOMESTIC APPLIANCE SPARES? 14" and 16" tubes from ONLY 19 SPECIAL OFFER - 21" FST 51EAL...Save 15...only 54 21" FST, narrow -neck only 69 GOOD OLD TUBES (not physically broken or faulty shadow mask) ALWAYS WANTED Comprehensive range of new and rebuilt tubes always available Ring IRENE or JANE for friendly, helpful advice. Carriage and VAT extra EXPRESS TV The Mill, Mill Lane, RUGELEY, Staffs WS15 2JW Tel: Fax: NEW CATALOGUE OF PATTERN SPARES NOW AVAILABLE AT A COST OF ONLY 4 TO NON ACCOUNT CUSTOMERS (RE FUNDED ON FIRST ESO ORDER) WHY NOT GIVE US A TRY WITH YOUR NEXT SPARES QUERY? DATAPART LTD ELECTRON HOUSE, 100 GREAT BARR STREET BIRMINGHAM 89 4BB SALES DESK FAX FREE SILVERSCREEN NEW MAJOR SUPPLIER Of Thorn & Granada ex -rental TV & Videos. Deliveries throughout South Wales, Devon & Corn wall. Call John on or visit us at 24 Gold Street, Tiverton Devon EX16 6PY Export welcome 446 TELEVISION APRIL 1993

61 affa. inana._ Approved Thorn Television Distributor for West Midlands TV WHOLESALE C. T. V. UNIT 5, THE PHOENIX BUILDING, RUSHOCK TRADING ESTATE, DROITWICH ROAD, NEAR KIDDERMINSTER TELEPHONE: / (24 HR) SUPPLIERS OF HIGH QUALITY EX -RENTAL TELEVISIONS AND VIDEOS LARGE STOCKS ALWAYS AVAILABLE ALL AT COMPETITIVE PRICES Also available: `B' Grade Products, Audio, Microwaves and Complete Range of Televisions and Videos OPEN: MON-FRI TEL: / (24 MI Fax: EXPORT ENQUIRIES WELCOME FERGUSON CHASSIS New and Complete TX10 14 TX86 Remote and 8 Button 14 TX90 14" 8 Push Button 14 TX90 20" White Spot 20 BLACK MESH DISH 60cm 25 INFRA RED DETECTOR SIZE 5" x 3" x 11/2" WIDE ANGLE IN CASE FOR BURGLAR ALARM USE PRICE 8 TEXT KIT FOR ITT SETS 7 Post 5 on all items SENDZ COMPONENTS TO ORDER SEE DETAILS ON BACK COVER TELEVISION APRIL

62 ; MINAI ANGLIAN TV WHOLESALE 'B' GRADE T.V,, VIDEO AUDIO, MICROWAVE NEW MAJOR BRANDS COMPLETE MINT AND BOXED BEST POSSIBLE PRICES EXPORT ENQUIRES WELCOME RING FOR DETAILS ANGLIAN TV WHOLESALE, NOW AT UNIT 4, BRECKLANDS BUSINESS CENTRE TAVERN LANE, DEREHAM, NORFOLK (0362) TV WHOLESALE TELECENTRE NOW OPEN 7 DAYS A WEEK FOR TOP QUALITY EX -RENTAL AND `B' GRADE TV'S AND VIDEOS. WEEKDAYS OPEN TILL 9PM. WEEKENDS & EVENINGS BY APPOINTMENT. 15 MINS FROM JUNCTION 16 M6 79A COLERIDGE WAY, CREWE. TEL: ACCESS AND VISA WELCOME AERIALS FOR TV & FM RADIO, PLUS 1000's OF MASTS, BRACKETS, LASHING KITS, CLAMPS, PLUGS, CABLES, OUTLETS, DIPLEXERS ETC. AMPLIFIERS FOR DISTRIBUTION SYSTEMS AND DOMESTIC, MAST HEAD OR SET BACK. WE HAVE ONE OF THE LARGEST RANGES, AVAILABLE FROM STOCK MAIN DISTRIBUTORS FOR ANTIFERENCE, LABGEAR, WOLSEY FRINGE, TRIAX, TELEVES, VOLEX-RAYDEX, KUBLER + MANY MORE CCASTAIL AlUILIIIAIL SUIDIDILIIIES UNIT X2 Rudford Industrial Estate Ford, Arundel NO MINIMUM ORDER VALUE Ailk CARRIAGEIA YFf3 tt 1 OTYRORIDCERR SSES2501 vis CREWE WHOLESALE TV LTD. WE HAVE SLASHED OUR PRICES. WORKING TV'S FROM WORKING TEXT TV'S FROM TAKE TEXT ONLY LARGE SELECTION OF WORKING AND UNTESTED STOCK. WORKING TOP LOADING VIDEOS FROM WORKING FRONT LOADING VIDEOS FROM WORKING LONG PLAYING STEREO VIDEOS ONLY AT LEAST 1 DELIVERY, TO EACH UNIT, PER WEEK. CALL NOW FOR NEW PRICE LIST. CREWE - OPEN 9.30 TO 5.30 MONDAY -FRIDAY TEL: * UNTESTED STOCK ONLY * BLACKBURN - OPEN TO 4.00 WEDNESDAY -FRIDAY TEL: o 0 SALE -Tfi1). QUALITY USED T.V. & VIDEO COMPLETE RANGE OF T.V.'s AND VIDEOS MOST MAKES AND MODELS AVAILABLE STOCK ARRIVING DAILY T.V.'s from 3.00 Videos from Prices Ex -VAT Free Delivery Service to most areas of the U.K. UNIT 80, BARRACKS ROAD, SANDY LANE INDUSTRIAL ESTATE, STOURPORT-ON-SEVERN, WORCESTERSHIRE DY13 90B Just 10 Mins from M5 Junct. 6 Worc's North For your export requirements contact us FAX: 0299 or TELEVISION APRIL 1993

63 TV WHOLESALE BESCO LTD EX -RENTAL TV's & VIDEOS NEW 'B' GRADE MAJOR BRANDS TV - VIDEO - HI-FI PORTABLES FST's NICAM FASTEXT SONY HITACHI PANASONIC ETC 100's of Ex -Rental & H.P. Repossesions from 10 VHS Video from 30 Huge selections. Complete range - All makes and models available. * NEW STOCKS EVERY DAY * PICK YOUR OWN VHS VIDEOS - Lots of each 100's Px Upright Vacs now available Working Ex -Equipment Panels IF Converger Decoder Line Scan Power Frame T20/22X T26 X X Philips G BRADFORD 16 Bottomley St Manchester Rd, BD5 7JL Ring Tony (0274) All prices include Postage & Packing. But + VAT MANCHESTER Unit 3, Mersey Rd. North End Est., Failsworth Ring David (061) Visa/Access Welcome Prices are Plus VAT& Based on Quantity OPEN 6 DAYS 9-5 FAX WESTERN TRADE SERVICES EST 14 YEARS 2A BARTON HILL ROAD TORQUAY DEVON TEL: FAX: DELIVERIES TO DEVON -CORNWALL WEEKLY NOW OPEN IN WALES WESTERN TRADE SERVICES UNIT 6 ISLWYN WORKSHOP PORTYMISTER IND ESTATE RISCA GWENT MP1 6NP TEL: FAX SUPPLIERS OF EX -RENTAL THORN & NON THORN TV & VIDEO WALKMAN LTD NOW OPEN New wholesalers of Thorn & Granada ex -rental TVs and Videos * Working - Non -working * Many Opening Offers Open Mon -Sat PHONE NOW UNIT 8, CUTLERS RD, SOUTH WOODHAM FERRERS, CHELMSFORD, ESSEX TELEVISION APRIL

64 TV WHOLESALE CENTRAL EX -RENTAL SUPERB RANGE OF TV'S & VCR'S THORN & GRANADA DIRECT LOADS AVAILABLE FROM SOURCE EXPORT ENQUIRIES WELCOME PHONE TODAY `13' GRADE SWITCH ON TO TOP QUALITY BRANDS OF OR BEST RESULTS ALL SIZES OF SCREEN TV AVAILABLE, BOTH IN FAST TEXT & DIGITAL NICAM STEREO VIDEOS: CURRENT MODEL Single, Twin Speed, Nicam S -VHS CAMCORDER C FORMAT, FULL SIZE, 8mm MICROWAVES PORTABLE HIFI SATELLITE VIDEOCRYPT PORTABLE 90 FULL REMOTE, BOXED CTV LONDON Eley Estate, Nobel Road Edmonton N18 TEL: FAX: Access CENTRAL TV WHOLESALE DISTRIBUTION LTD 369 Stratford Road, Sparkhill Birmingham B11 TEL: FAX: =ws Z 2411 OSCILLOSCOPES - EP. 1740A 100MHz Dual Trace H.P. 1741A 100MHz Dual Trace Analogue Storage 325 HP. 1744A 100MHz Dual Trace Analogue Storage 325 HP. 182C 100MHz 4 Channel 300 H.P. 196A Oscilloscope Camera 70 TEKTRONIX MHz 4 Channel. born 300 TEKTRONIX MHz 4 Channel Analogue Storage POA TEKTRONIX MHz 4 Channel Analogue Storage from 325 TEKTRONIX MHz 4 Channel SPOA TEKTRONIX P FET Oscilloscope Probe (1 IGHz) 100 Power Supplies/Frequency Counters/Digital Multimeters/AVOs/Component Bridges/Pats Testers/ Spectrum Analysers/PuLse Generators - MANY TYPES H.P. 3200B VHF osc 10MHz-500MHz 350 H.P. 4204A oscillator 10Hz- IMEz f100 H.P oscillator 10Hz-13MHz 150 Marconi TF 1073A R/F attenuator 0-100dB 25 Marconi /1 spectrum analyser (110MHz) 1250 Marconi TF 2904 colour/gain + delay test sets... P0A Marconi TF 2939 grey scale generators. fp0a Marconi IT 2905/6m sine/square pulse bar generators P0A Marconi TF pattern generator + SLMS... POA Marconi TF 2606 differential voltmeters... P0A Marconi TT 2213A/1 X -Y display f50 Marconi TF MHz oscillator with Q meter Marconi TF (circuit magnification meter) Marconi TT 2604 electronic voltmeter.. 50 Electrostatic 5KV voltmeter Brandenberg 2475R photomukiplier power supply (2KV) 75 TEKTRONIX FET Probe Power Unit tc 80 TEKTRONIX MHz Digital Storage IPOA TEKTRONIX MHz fp0a TEKTRONIX MHz 4 Channel Programmable digitizing LPOA TEKTRONIX 11302A - 500MHz 4 Channel Programmable digitizing with integral 750MHz counter LFOA PHILIPS MHz Dual Trace.. E150 PHILIPS MHz Dual Trace born 250 PHILIPS MHz Dual Trace 150 PHILIPS MHz Dual Trace from 350 PHILIPS MHz Dual horn 525 BRADLEY Oscilloscope Calibrator fgo Gould J3B 10K-100KHz oscillator Anderson prom eraser 1:30 Roband 500 voltmeters (1Kv) Wendel & Goltermaim P5G1 test signal generator ( I8MHZ) S60 Deftest family module general purpose behest family module linear devices Deftest family module digital devices Deftest family module remote test head Deftest family module power supply urn English Electric - insulation tester.. GEC flash tester Intel - universal prom programmers. Component test seu total =f L'S Danbridge CDB I capacitance deviation bridges 150 AZ Tech - isolated line conditioners Racal 9303 & true RMS R/F level meters with sensing heads DO Tektronix 494P 10Kliz - 21Gliz P0 Tektronix 494AP 10KHz - 2IGHz......IPOA Decade R/CN boxes from 0 Many other items availab,e. Send SAE for List and Prices or Fax List Available. Low Cost Delivery can be Arranged, if required (VAT to be added to Prices and Delivery). All Guaranteed 3 Months. V Grade Audio Products and 13' Grade TVNideo Products Available. Send for Price Lists. TELNET 8 CAVANS WAY, BINLEY INDUSTRIAL ESTATE, COVENTRY CV3 2SF (Premises situated close to Eastern By Pass in Coventry with easy access to MI, M6, M40, M69, A45) Telephone: Fax: ELECTRA TV LTD U*it 5, Santa Pod, Nr Poddington Airfield, Hinwick, Wellingborough, Northants NN9 7JQ. Telephone Rediffusion MK4/MK4A Working TVs Off the pile Basic Basic Teletext Teletext Price list for spares Line board 90/110 working each Power board 90/110 working Used handsets working 6.00 Also other spares available. Export enquiries welcome. Please note we only deal in Rediffusion MK4/TVs and MK4A I 450 TELEVISION APRIL 1993

65 TV WHOLESALE TELEPRICE LIMITED SWITCH ON! TO QUALITY EXRENTAL TV & VCR. PLEASE RING FOR DETAILS UN T F2, COPLEY HILL TRAD NG EST., WHrTEHAL_ RD, LEEDS LS12 1I -S. TEL LES CORKE 5 PORTVIEW ROAD AVONMOUTH, BRISTOL BS11 7LQ. TEL: KARLA REALE 9 COLQUHOUN AVENUE HILLINGTON ND. EST. GLASGOW G52 4BN. TEL: IAN DC RAN UNIT 8, ASCOT PARK INC USTRIAL ESTATE SANDIACRE, NOTTINGHAM. TEL: JOHN JEYS 9A/B, 94 CARRMERE RD LEECHMERE IND. EST. SUNDERLAND SR2 9TE. TEL: BRIAN CADE 22 FRANTHORNE WAY, OFF RANDLESDOWN ROAD. BELLINGHAM, LONDON SE6 3BS. TEL: JAMES MAYE 40 INVINCIBLE ROAD FARNBOROUGH HANTS GU14 MU. TEL: COLIN GORDON

66 TV WHOLESALE MANCHESTER'S NEWEST WHOLESALER WHERE CAN YOU FIND WORKING STOCK, READY FOR AZ REF PAGE 50 2A YOUR SHOWROOM? LESS HASSLE MORE PROFIT! HERE BASIC TELEVISIONS FROM 15 TELETEXT FROM 35 FRONT LOADING VIDEOS FROM 35 OPEN MONDAY TO FRIDAY 10AM TILL 5PM UNIT 20, RED BANK ARCHES, RED BANK MANCHESTER M4 4HF CHEQUE ACCESS VISA ADVERTISERS' INDEX Aerial Techniques 409 Alban Electronics Ltd Anglian TV Wholesale 448 A -Z Electronics Besco Ltd 449 BK Electronics 444 Campion Wholesale TV Ltd 448 Central TV Wholesale Ltd 450 Centrevision 443 Coastal Aerial Supplies 448 Crewe Wholesale TV 448 CTV 447 Datapart Ltd 446 East London Components 397 Economic Devices Electra TV 450 Euras International Ltd 445 Express TV Supplies 446 Eye View 443 GGL Components Grandata Hardy, J.W.436 J.J. Components 423 Manor Supplies 40'7 Marapet 439 Powell, T 441 Promax Instruments P.V. Tubes 397 Repo TV 443 Sendz Components 447, 459-OBC Shudehill 452 Silverscreen 446 Stewart of Reading 441 Swift TV Publications 436 Telecentre 448 Teleprice Ltd 451 Telespares Ltd 400 Telnet 450 Vista Electronics 439 Walkman 449 Well -View 439 Western Trade Services 449 Willowvale Electronics Ltd IFC W. Tree Trade ICS Intertext Group 397 Wharehouse 452 NEW BUYS ON B GRADE STOCK ALLOWS US TO OFFER YOU THE FOLLOWING 14 portables working 89 All boxed with instructions R/C long play videorecorders working 99 All boxed with instructions DISCOUNT ON QUANTITY 21", 25" and 28" Nicams working All boxed with instructions TEL FOR PRICE B grade Audio from 12 many working Customer returns in block. Example. Untested 3x21 FST 3x25 FST 6xF/L Videos 40 each. Total 480 VAT This price does not include handsets. Some in need of repair, some working. Ex -rental TVs, all untouched. Basic 15 R/C 20 & 25 Text 25 & 30 Videos T/L 22 F/L 40. All untouched. VV TREE WAREHOUSE UNIT 1, SUNSHINE MILLS, WORTLEY RD, LEEDS 12 TEL: / FAX: TELEVISION APRIL 1993

67 CLASSIFIED CLASSIFIED CLASSIFIED CLASSIFIE EIE CLASSIFIED No other consumer magazine in the country can reach so effectively those readers who are wholly engaged in the television and affiliated electronic industries. They have a need to know of your products and services. The prepaid rate for semi display setting is per single column centimetre (minimum 3 cm(. Classified advertisements 8.40 per line, box number extra. All prices plus 171/20/0 VAT. All cheques, postal orders etc., to be made payable to Reed Business Publishing. Advertisements, together with remittance, should be sent to The Television Classified, 11th Floor, Quadrant House, The Quadrant, Sutton, Surrey SM2 5AS c, PHONE FAX SPARES & COMPONENTS VISA AMSTRAD HANDSETS VCR4600,4600Mk VCR4700 (Not long play) VCR VCR6100 (Indexer) VCR6100 (Barcode Indexer) VCR9000 (Old type) TVR TVR SRD TS90/99 Tower System AMSTRAD LOPTS CTV1000 FB182K CTV1400 FB165KA CTV CTV CTV2000 F B CTV2000 FB171K 9.40 CTV CTV TVR TVR CTM644 Mk PC12-HRCD/D MSH1FCT PCW9512,8256, FERGUSON LOPT MMO6 00D AMSTRAD TUNERS UE33-B UE2 -B31F ENV87358F ENV87509F UVE33-F01 VHF -UHF UVE33-F02 VHF -UHF VHF -UHF Harrison Electronics CENTURY WAY, MARCH, CAMBS PE15 80W. FAX: (0354) TEL: (0354) AMSTRAD MODULATORS ENP-E VCR4600Mk11, SRD 100/200/ AMSTRAD SERVICE MANUALS VCR VCR4600Mk11, VCR VCR VCR9000/ AMSTRAD OPERATORS MANUAL PC AMSTRAD VCR MECHANISMS 4500,9000 (Old model) CASSETTE HOUSING ASSY ,4700,TVR1,2,3 COMPLETE MECHANISM ASSY. (Excluding Video Heads) COMPLETE MECHANISM ASSY. (Excluding cylinder assy.) MECHANISM DECK (Excluding Cass. housing assy. & Cylinder assy.) CASSETTE HOUSING ASSY CYLINDER ASSY. (incl. Standard play Video heads) CYLINDER ASSY. (excluding Video heads) CYLINDER LOWER DRUM ASSY. (Excluding Motor) 9.99 HEAD BASE ASSY. (Audidi 5.88 AMSTRAD IF UNITS TPS7-B TPS7-L AMSTRAD MOTORS Loading Motor MCB9B02 Drum Motor E20EL05 Capstan Motor LLN4B21 Tape Loadirg MCF9B02 AMSTRAD PCB's (Complete, fully populated) 4500 Timer 4500 Systems Control 4600 Systems ControVServc, Display & Control PCB's 4600 Display 4600 Control 4600 Video & Audio 4600 Power Supply 4600Mk11 Main PCB Assy. 4600Mk11 Timer 4600Mk11 Control 4600Mk11 Head Amp Assy. 4600Mk11 Power Supply 4700 Main PCB Assy Timer 4700 Control 4700 Head Amp Assy 4700 Power Supply 5200 Timer & Channel DIsp 5200 Video C 5200 Switch Panel 7000 Switch PCB no: CTV1400 Switches,Presets & Tuner (UE2-B31F) 8.23 CTV1400 Switches,Presets & Tuner (ENV87358F2) 8.23 CTV1400 Switches, Presets & Tuner (ENV87509F2) 8 2' CTV2200 PCB no: CTV2200 PCB no: TVR 1 Control Panel & Presets 7.05 TVR 2 Main TV PCB TVR 3 Main TV PCB TVR 3 TV Power Supply TVR 3 Head Amp Assy 5.88 TVR 3 Video Power Supply 4.70 VMC100 - Various parts available. please phone for prices. MITSUBISHI/SALORA Various Video PCB's and Cassette Housings available - see our full list for parts and prices. BSR DECK SM103/104 Linear tracking Record Deck CARTRIDGE/STYLI CZ800-1/ST SANYO VHR1110, 1150,1300,1700,2300 FUTEK F501 Replacement Video Heads 7.05 CAMERA/CAMCOR- DER BATTERIES FERGUSON Videostar VA HITACHI VM-63A,VM-5200A VGMC AMSTRAD SOFTWARE ACCOUNTSMASTER Lan (Full accounts program for running small business on any PC) INFOMASTER (Easy to use Database, runs on PC) AMSTRAD COMPUTER & PRINTER SPARES - Many spares available, please phone for price. PRICES INCLUDE VAT. AU ME BRAND NEW AND GUMUU1WED * * SAME DAY DESPATCH * * Write or Phone for FULL catalogue. **POST & PACKING** 7sinl iiim **EXTRA** RCS VARIABLE VOLTAGE D.C. BENCH PONIED SUPPLY I lo 7d v../1, pp 2 amp I lo 20,011:2010!11,, volls up In I '7 amps D C fully slabtitsed Twin panel mop, art nslafr. and tunnel reading Overload [MAKS,. Wry NEW MODEL. 4 sff te,of f Post & Ins C1 DC at 6 amp 10 amp.. Iwo panel meters SiZe C96,nc VAT Carr Pf, RADIO COMPONENT SPECIALISTS 337 W E ROAD, CROYDON SUPAEY, U.K. Tel: LIS, Large SAE Delmer, 7 days Callers Welcome Closet Wed TRAINING It too [quire.1 home stud Lout-se in the timilimental, ill electronics. either to begin ;ism -cu. pursue 2 hoht,. or retresh tt /LI I (no \oledge, BASIC ELECTRONICS Irum the Direct Personal Leartnnt. scheme. could he lust shat ou'rt2 looking Sir. Conlact: K. Sparrou etc... I I Oa) don Green Whitchurch BRISTOL At on BS14 ONG 'telephone: SURPLOSIEDUNDANT ELECTRONIC COMPONENTS WANTED TCs - Tuners - Transistors - Valves - Diodes etc. am quantity considered - immediate payment. Al)N1 Electronic Supplies Tel Fax ADVERTISERS PLEASE NOTE FOR ALL YOUR FUTURE ENQUIRIES ON ADVERTISING RATES, PLEASE CONTACT PAT BUNCE ON; TEL ; FAX SERVICE DATA TELEVISION ENGINEERS Radio Shop's NEW TV fault finding guide. Over 500 faults - many previously unlisted - covers most makes - over 200 chassis E (inc p & p) RADIOSHOP 38 FAIRFIELD ROAD BUDE EX23 8DJ (0288) Radio H. B.H Woolaeottea std VISA Access TELEVISION APRIL

68 10 Technical CLASSIFIED CLASSIFIED CLASSIFIED Information Services 76 CHURCH STREET, LARKHALL, LANARKSHIRE,ML9 1HE Mon-Fri 8.3am Tel.(0698) pm or (0698) Outwith business hours 411%ww ' FAX facility available all day on both lines Write now with an SAE for your FREE QUOTE, FREE CATALOGUE & FREE NEWSLETTERS ANY TRADE ADDRESSES GIVEN!FREE! JUST PHONE TO FIND THE NUMBER/ADDRESS YOU NEED All orders under please add 2.00 p&p, Under add 2.50 p&p, Orders over post free. A few fast selling titles from our stock of over 200 Practical TV Repairs 2nd Ed Domestic Equip' Serv'& Rep' Refrigeration Pocket Book 1495 CTV Servicing by G.King Servicing Mono TV's Spectrum Repair Guide 5.00 The PAL System 8.50 Buy -Sell -Repair Used TV's 9.95 BBC Micro A B + & peripherals MOD TV & Video Technology Microwave Servicing 9.95 Europ'n Scrambling Sys 'New Ed' TV & Video Engineers P/Book Hi-Fi Servicing Guide 9.95 Nevrnes Data Corn P/B 'New* 2nd Ed 12 6 Practical Radio Serv'& Repair Buy -Sell -Repair Used VCR's 9.95 Newnes Electr Assembly P/B 'NEW* 14Z MANUALS WE HAVE THE WORLDS LARGEST COLLECTION OF SERVICE SHEETS & CIRCUITS Complete list of all Service Manuals, Service Sheets, Technical Manuals & Circuits in the Data Reference Manual 3rd Ed WE ARE THE SOLE SUPPLIERS OF MOST FAULT-FINDING GUIDES, REPAIR MANUALS & TECHNICAL MANUALS INTEGRATED SYSTEMS FROM TIS 7 LARGE BINDERS OF VCR CIRC'S & MATCHING FAULT-FINDING GUIDES (upto 1989) 10 LARGE BINDERS OF CTV CIRC'S & MATCHING REPAIR DATA (upto 1989) BOTH OF THE ABOVE PLUS OVER OF ADDITIONAL MATERIAL inc. TVAR 1& SERVICE MANUALS For most U.K. European, Far East & USA types of TV - VIDEO - CAM - SAT - M/WAVE - CD and all at reasonable prices. VCR circuits also available separately for some models Some examples from thousands of video manuals available. These are all complete at 10 each PANASONIC NV-FS100, L20, NV-MC10, MC20, MC30, MS50, ORION D500, D1000/1100, D1200, D1500, D2000, FERGUSON FV11R, FV12L, FV13H, FV14T, FV20B, FV30B. DAEWOO, DVP1171, 1373 DVR4167, 4561, 5166 For other makes & models phone for price & availability. All U.K. orders subject to 1 p&p. No VAT D-TEC PO BOX 1171, FERNDOWN, DORSET BH22 9YG. Telephone: FAST FIX Faint IInc1eX Now in NEW A4 Book Format, containing nearly 200 pages. FAST FIX contains several thousand TV, Video, Camcorder, CD and Satellite fault symptoms from TV Magazine covenng the years inclusive and is arranged alphabetically listing Make, Model, Fault Symptom and Page Reference. Complete FAST FIX index inclusive. Overseas orders please add FAST FIX IS REGULARLY UPDATED AND ALL NEW ORDERS WILL RECEIVE A FREE UPDATE VOUCHER TO COVER THE FIRST UPDATE. Send Cheques/Postal Orders, payable to: A.G. Humphreys 13 Mansfield Avenue St. Johns Park Hawarden, Chvyd CH5 3S6 N. Wales For further details, tel AMSTRAD, LOGIK, MATSUI-SAISHO FAULT FINDING GUIDE Covers hundreds of faults on a wide range of television and video recorders. Professionally compiled in easy to locate format. SAVES TIME AND MONEY by pin pointing faults in record time. SEND p.p. TO R. ROWLAND 438 Poynters Rd, Luton, Beds. LU4 OTW E.C.S. INDEXES! THOUSANDS SOLD WORLDWIDE Edition 9 of the complete indexes now published containing approx 8,000 Faults listed in 12 Years of Television magazine. Indexes are alphabetically listed by Make, Model, Fault, Ref and are now available for just: 8.00 For Television & Satellite Faults 8.00 For Video, Camcorder & CD Faults Or for both sets complete with chassis & similar model guides. Please add 1.50 (UK), 3.00 (Overseas) to total order to cover post & packing. A LOW COST UPDATE SERVICE IS ALSO AVAILABLE. FULL DETAILS DESPATCHED WITH ORDER. To secure your copy/s please make Cheques/Postal Orders payable to: E.C.S. 31 Prenton Road West, Prenton, Birkenhead, Merseyside L42 9PY 454 TELEVISION APRIL 1993

69 Covers TELEVISION SERVICING ISBN X Reprinted Edition of Original Book Akai CT 2570 CT 2820 Amstrad TVR 3 Dacca DT 8757 DT 9752 DT 9757 DU 8760 DU 9754 DU 9760 DUV 8761 DUV 9761 Finlux 1000 Series Fisher CFB 1744 CFB 1745 CFB 2144 G.E.C. C 2004 C 2005 C 2204 C 2205 C 2153 C 2154 C 2501 DV 8759 DY 9758 C 2502 Goldstar DBS 9852M CIT 4442 DYS 9894M CIT 6105 Etron CIS 4361 EC 1451R C1S 4441 Ferguson C1S 4442 MC09 CIS D1 14 D2 CIS 9325 Grundig 14 J1 CUC J2 CUC J9 CUC H2 CUC H3 CUC K2 CUC K3 CUC 3850 Fidelity Hitachi CTV 140 CPT 2174 CTV 1404R CPT 2176 CTV 1404R1 CPT 2178 CTV 1405R CPT 2476 CTV 1405S CPT 2478 CTV 2001 CPT 2128 CTV 2001R CPT 2528 CTV CPT 2196 CTV CPT 2198 C 20R03 CPT 2578 C 20T03 MV 1402 ITT CT 330 TX 3126 TX 3328 CT 3326 CP 3228 CT 3448 CT 3548 FX 3548 FX 3448 MC 3898 SFX 3489 SFX 3578 SEX 3588 SEX 3878 SFX 3888 Kingley 14 Luxor Murphy M 14S01 M 14R01 M 20R01 M 22S01 M 20TOT M Mitsubishi CT 1501 BM CT 2028 FM CT 2228 FM CT 2101 TX CT 2131 EM CT 2131 EST CT 2132 TX CT 2141 BM CT 2141 LM CT 2142 LM CT 2142 TX Mitsubishi Panasonic CT 2531 BM TX 2112 CT 2532 TX TX 2122 CT 2532 LM TX 2450 NEC TX 2461 FS 2120 TC 1460 FS 5906 IC 1465 Nikkal TC 1470 Baby 10 TC 1475 TLG 14R TC 1865 TLG 060/6000 TC 1875 TLG 88/89 TC TLG 0101/0909 IC 148 Olympic TC 1485 TC Panasonic IC 2185 TX 1788 TC 2475 Philips TX 1 210E 4550 TX 2 TX E 4559 TX CE 4570 TX CE E 7550 TX E 7650 TX CE 7570 TXC 71 27CE 7590 TXC 84 TXC CE CE 7790 TXC CE 1200 TXC CE 1201 TXC 74 14CE 1500 TXC 78 15CE 1010 TC CE 1210 TC 2051 TC CE 1518 TC CE CE 1530 TC CE 1538 TX E 1051 TX E 1059 TX E 1250 TX 2165 TX E E 1259 TX E 1550 TXC E 1551 TC 2110 Philip* Samsung 210E 1557 C1 3517Z 210E 1558 Cl 517F 2244cCEE Sanyo C 24CE 3271 CBP CE 3578 CBP CE 3588 CBP CE 3290 CBP CE 3590 CBP CE 3598 CBP CN 3001 Sharp 5Dvy KH 88KE 7807 SV 287XH 27KE 1112 C 1420H 27KE 1115 C 3703H 37KE 1022 C 1421H 38KE 1102 CV 3709H 43KE 1312 CV 2121H 43KE '1415 CV 2123H 5423KE csolarvox 52KE 1515 CML 14R 52KE 1585 Tatung 59KE Series 59KE Series 58KE Series 68KE 3902 Toshiba 88KE KE R7 B2 37KN R7 BR Salora 145 R7 BW 145 E7 B2 14 L37 145E7 BR 15L E7 BW 21 L R6B 24L50 Samsung 210 R6B 210 T6B Cl 338GA 214 R7B C 1 338XA 255 R7B Cl 340ZA 255 T7B Cl 347FA 258 R7B C1 348ZF Cl 517Z 289 T6B TELEVISION SERVICING Kg Book 1SBI Akai Bush Goodmans CT TT CT 2579N CT CTV 2R CT 2870N 2921 Granada CT 2879N 2921T C 51GV2/4 CT Grundig CT CUC 3840 Alba CUC 4400 CTV S c-ry CUC 4401 CUC 4410 CTV 57 CTV 100 CUC 4500 CTV 703 De Graaf CUC 4511 CTV 704T C36JS2 Grundig CTV 711 C511-1S4 CUC 5300 CTV 712 C14HSB CUC 5820 CTV 713 C59JZ5 CUC 5835 CTV 741 D41HS4 CUC 5836 CTV 743 D51HS4 CUC 5860 CTV 744 D51HZ5 CUC 5880 CTV 746 D59HS4 CUC 5891 CTV 747 Ferguson Harwood CTV P3 9014R CTV 752 A 51F Hinari Baird 66 M3 HIT 109 RR6890N 78 M5 HIT 14 Boots J59 P8A HIT 14S CTV 1414 Repair HIT 14T 1414R Hints HIT 14RS 1010 Fidelity HIT 14R Beon CTV 920 HIT 20R 1412 Finlandia HIT 51T Bush C51HZE Hitachi 2214 D59HZ5 C14 P D66HZ5 C 14 P Finlux C C 2118R C 2118T 2520 Goldstar C 2519TG 2520T CIT 2168 Hitachi 2512 CIT 2168F CPT CIT 2191F CPT CIT 2190F CPT CIT 4902 CPT CIT 9902F CPT 2598A 2721 Indianna ITT/Nokia UK NEI Philips 2131TX 1021 Nikkei 1220 NT NT TLG TLG TLG TLG TLG Orion ARX ARXS 8841 JVC 14ARXG 9666 AV 21F1EK 14AT 9762 AV 25FIEK 14VR 9763 AV N280EKT Osaki 9765 Logic 3214S Demme 9637 Luxor CTV 1474R Panasonic 9765 Matsui TC 21R R TX TX 21V1 Pioneer 1420 TX 25W2 SD 21AV 1420B C B TTA N NEI 1451R 1451TX 1551TX 100Mk18. Mk112131R TX 28A1 TX 28W2 TX 24A1 TX 33A1G TX 1100G TX 1485 TX 1785 TX 1786 Perdio P1408 P2004 P2005 P2101 P2102 STX 400 Philips SD 21AVISD 25AVI SD 28AVI Pye Saisho CM 215TS CM CT 141 CT 141B CT 143 CT 1446 CT 144R Samsung CT 146TX CT 149TXA TXAFST 212TA C 1210R C 1212R C 13312Z C 15012Z C C C 15322Z Salora 21 D D D61 26 A D 81 Sanyo CBP 2572 CBP 2573 CBP 2872 CBP 2873 CBP 2558 CBP 2559 CBP 2162 Sharp C 1430H C 1431H C 3720 DV 51083H DV 59083H DV 66083H SV 2588H Sony KV D3412U Ssang Yong 0014 Tatung A Series Toshiba 216 R R9B2 216 T9B 216 T9B2 217 D9B 217 D9B2 TELEVISION SERVICING Models VIDEO SERVICING Aiwa HVG-55 Akai VS -422 VS -425 VS -427 VS -487 VS -485 VS -765 VS -787 Alba TWO 336 Page Volumes SBN Goldstar GHV 1290i GHV 1296i GHSE 1298i VCP 4300i Goodman* VTV 300 VCP 500 VCP 550 TX 1101 PX 1101 Hitachi VT -522E VT -530E VT -580 VT -M622 VT M630 VX 888 VCR -M3 VT.M840E VX 3000 VCR-LD3 ingsrsol VX 6000 VCR-MD3 VR365 VX 6000A VXL 12 VR995 VX 6600 VTV 300 ITT Mitsubishi D 1200 VCR xl PX 2200 VR-3619 HS -011 Osaki VCR PX 2201 VR-3719 HS -B21 VCR -34H VCR VCR 2500 VF Murphy Panasonic Amstrad DX 3300 VP VCR NV -L20 VCR 8600 Granada VF NEC NV -L28 VCR 8700 VHS -FYI VR-3929 PX-1200K NV -J30 Baird VHS-GY2 VR-5720 DX -1800K NV -J34 VC141L VHS-GY4 VR-5730 Nikkei Philips Bush VHS-FS4 VR J1 VR-6180 VCR 3401 Grundig VR-5760 Nord- VR-6182 VCR 3451 VS -500 JVC mends VR-6185 De Graaf VS -520 HR -D320 V1005M VR-6285 WHS-FS4 VS -540 HR-D700EK VR-6182 VR-6470 Ferguson VS -550 HR -D750 V1005MI VR-6490 FV 208 TVR-4500 HR -D830 V105U VR-6548 TVR-4510 Logik FV 21R VR-6648 V1805KV1805U TVR-5510 FV 22L VR945 VR-6670 Hinari FV 26D VR950 V1905K VR-6870 FV 3OR VXL-8,9,11,18 VR955 V4000 Pioneer FV 31R VXL-10 VR960 UNIC VR-525 FV 32L VXL-12 VR960A Orion VR-727 FV 33H VXL-90 Matsui VCR-LAI PyeFV 37H VCR -34H VCP 100 VCR -L1 DV186 VC 141L VTV-100 VX 730 VR-MDTT1 DV190 Fidelity VTV-200 VK 735 VCR -X1 DV 286 VTV-300 VR900 VX 735A VCR -M2 DC Finlux Hitachi VX 50 VCR -L2 Saba F70 V 7755 VR 3300 VA- VR-6420 VT-S80E VX 765 VR 3400 MDTTST2 VR-6640 Matsui Orion Salaho Santa VX 770 VCR-LADST2 VXL 12 VX 8500LP VX 850 VR-LDST2 VXL 12X VX 8600LP VX 868 VR-LD2 VP 3000 Sharp VX 877 VR-LD3. VRS 3200 VC -A100 VR 3300X VC -A105 VR 3400 VC -Al 11 VR 3500 Sharp VR 3650 VC -A131 VR 3700 VC -A140 VR 3800 VC -A170 VRS 4000 VC VRS 4200 VC -A510 VRS 4400 VC -A501 VRS 5000 VC -A502 VRS 5000X vc.7510 VRS 5500 VC -793 Sabra VC -D801 SV-6800 VC -A5011 SV-8900 D 805 SV-6910 Sony SV-9900 SLV 201 Samsung SLV 301 VI -710 SLV 401 VI -711 VI -730 VI -750 VI -770 Tatung TVP1311 Telefunken VR-4935 VR-4945 Thompson VI -790 VI -970 Sanyo V-610 VHR-4150 v..830 VHR-4350 Toshiba VHR-D4410 V-1099 VHR-D4610 v.209b VHR-5200 V -300B VHR-5240 v_309b VHR-5350 v-5008 VHR-D5450 V.5099 V-7008 V -700H SATELLITE SERVICING Covers 127 Models ISBN Alba Dacca Ferguson SAT 200 TRX 1851 SAP 2 SAT 300 Discus SAP 2S SAT 400 ELIPSE SAP 4S SAT 450 Drake SAP 5S SAT 500 ESR 100 SAP ES SAT 4500 ESR 150 SAP ;S SAT 6011 ESR 200 SRA1 Amstrad ESR 250 SRA1 - S Fidelity ESR 1240E SRB1 SRX 100 ESR 4240E SRV1 SRX 200 ESR 4240S SRD2 SRD 400 VM SRD4 XLE Bush ECE SABA Finlux NEC SAT 500/2 SS 2TC SR SM 1000 ECE Telefunken Fuba 3025 SR 2000 SR Nordmende SR 2500 ECE Thompson Grundig SS 2100 SR SRS - 3 STR 20 A Oceanic SR 3000 Echostar STR SR 3200 SR 500 STR 22 A OEM SR 3500 SR 1500 STR 22 B 5100 SR 5000 SR Pace SR 6000 SR 5500 GR IRD 2000 SS 3000 Channel Eurosat ITT Nokia SS 6000 Master SRT 50 SAT 1000 SS Ferguson SAT 1200 SS SAP I SAT 1200A SS 9200 Connextions SAP 15 SRT 40 ITT Nokia Panasonic 5100 TU-S100 Luxor Philips 0051 STU STU MK1 STU MK2 Phoenix 8100 PH PH Saba 9570 SSR Sakura SR 800 ER SR 800 RS SR 865 ER SR 868 SR 870 S Salora MK MK SRV 11 XLE Sanyo SS 9200 IRD BSC 1000 VIDEO SERVICING NO LONGER AVAILABLE All Books Contain: CIRCUIT DIAGRAMS. SCOPE READINGS. VOLTAGE TABLES. ESSENTIAL PART NUMBERS. ALIGNMENTS & ADJUSTMENTS. TROUBLE SHOOTING GUIDES If ordering several books please ring for credit details Schwaiger SS 9000 Sentra SX 1000 Sony SAT 503 Tatung TRX 1801 Technisat ST 4000 S ST 4000 S NEW ST 4000 S MAC ST 6000 S Telecele STU 800 STU 800/19R Telefunken SR 1002 Toshiba BTR 5 Triax TRIASAT 2000 TRIASAT 2000S Tristar SR 2500 Vortec JUPITER JUPITER II STAR POST, PACKING & INSURANCE 1 Book or more Books 7.00 Note: Video Servicing is a TWO volume set and is therefore 7.00 delivery. Professionally Produced with the Manufacturers Full Co-operation 4 South Parade, Bawtry, Doncaster, Yorkshire, England. DN10 6JH Tell: Fax:

70 MAURITRON TECHNICAL PUBLICATIONS A selection from our range of Technical Books and Guides for the TV & Video Trade TELEVISION EQUIVALENTS. New Book lists Exact Equivalent for Many different Makes. Order MP TELEVISION CHASSIS GUIDE. Identify your TV chassis from the model number. Order MP VIDEO RECORDER & CAMCORDER EQUIVALENTS. Makes A - J. Order MP Lists all known models and their Equivalents. New 2 Volume Set. Makes K - Z. Order MP VIDEO RECORDER FAULTS Repair Guide for Beginners. Know where to start looking/ Order MP VHS VIDEO RECORDER PRINCIPLES Essential Theory on the Principles of operation of VHS Order MP CMOS DATABOOK Detailed Specification on the 4000 Series with circuits. Order MP TTL DATABOOK. Detailed Specification on the 7400 Series with circuits. Order MP TRANSISTOR EQUIVALENTS AND TESTING MANUAL. Includes Testing Procedure. Order MP POWER SUPPLIES, STABILISERS & VOLTAGE REGULATORS. Includes Circuits Order MP REMOTE CONTROL CIRCUITS - TV. Dozens of Remote Control Circuits for Colour TV's. Order MP MANUFACTURERS EQUIVALENTS. Know which Makers Trade Names are the Same. Order MP VIDEO HEAD CLEANING KIT. Unique Kit with Comprehensive Instructions on how to do it right. Order VHCK VIDEO TEST JIG. Run the machine and gain access to the mechanics as well. Order VTJ SCART EUROCONNECTOR SYSTEM. Detailed Pinout Specifications of this interface. Order MP SWITCH MODE PSU IC TYPE TDA Comprehensive Details of this popular TV PSU IC Order MP TELETEXT REPAIR MANUAL. Covers the SAA range as used in many Sets. Order MP P.C. HARD DISC DRIVE REFERENCE MANUAL. Specifications of l-fundreds of Hard Discs. Order MP CITIZENS BAND RADIO CIRCUITS MANUAL. Covers Dozens of popular models. Order MP RECORD PLAYER SPEED DISC. Lets you accurately align any turntable speed. Order MP CITIZENS BAND RADIO DATA REFERENCE BOOK. Technical Specifications of C.B. IC's. Order MP TELEPHONE CODE LOCATION GUIDE. Find the Town from the Phone Code. Order MP VALVE AMPLIFIERS CONSTRUCTION MANUAL. Full Building Details for Vintage Buffs. Order MP VINTAGE WIRELESS SERVICING. 2 Volume set covers Vintage Servicing in detail. Order MP OFFICE EQUIPMENT EQUIVALENTS. Complete Cross Reference for all Photocopier or Fax. Order MP REEL TO REEL TAPE RECORDER SERVICING. Details on Reel Servicing for Collectors. Order MP SERVICE MANUALS WE HAVE THE MOST COMPREHENSIVE LIBRARY OF SERVICE MANUALS AVAILABLE ANYWHERE. From the Earliest Valve Wireless to the Latest Video Recorder. Originals or Photostats as available. Colour Televisions, Video Recorders, Test Gear, Audio, Computers, in fact practically anything. If you need a Service Manual, Give us a call. MAURITRON PUBLICATIONS (TV) 8 Cherry Tree Road, Access Phone your Credit Card Order 11 order plus 2.35 P/F) for Immediate Despatch Chinnor, Oxfordshire, "ak OX9 4QY Tel:- (0844) Fax:- (0844) Many new Titles coming soon - Write or Phone for your FREE catalogue. 456 TELEVISION APRIL 1993

71 SIISI. ( OCCIFIFP CLASSIFIED CLASSIFIED CLASSIFIED CLASSIFIED RELAY OMAGH LTD SOFTWARE ()WU TER WARE DO YOU RENT TELEVISIONS? DO YOU STILL USE A CARD SYSTEM? DO YOU FIND IT DIFFICULT TO KNOW YOUR ARREARS TOTAL AT ANY GIVEN TIME? If you do then we recommend our computer TV and Video Rental package. This package includes * automatic updating of each customer's record * alphabetical pnnt-out of each customer's arrears and payments missed * total arrears immediately available * easy to use and operate. NEW HIRE PURCHASE PROGRAMME NOW AVAILABLE AS WELL. These pir grammes,,eras, IBM,nnipatibles runrcild wider MS-DOS Free demonstration discs ava Table CONTACT WILLIAM J THOMPSON Donaghanie Post Office Beragh Co. Tyrone Telephone Beragh (0662 7) TUBES REBUILT CRTs VDU - MONITOR - TV Image Burn -In Removed From Screen Phosphers B.S.I. Certification N.G.T. ELECTRONICS LTD. 120, Selhurst Road, London SE25 6LL PHONE: Britain's Oldest Established Tube Rebuilder FOR SALE CRT FOR MONITORS, SCOPES, RADAR ETC (not domestic TV) / fal 00 POA CV I 'PI C M7-120/1 C1050 POA LS3/ I0001 C1207 7/ M aPA CHM 014-1= VII L ClatO V CAI 00 ISOCS4 C A L5300 8(11.188' C CP CA SI MAO / O(14311 POA /11667 C14 00 D ( M C2900 C8(1523/ IW 0100 G CI C C2403 M fallk CRE1400 C / LA NA CVI E E328P CPI% CAM C CY A CAM SEJP f C41 CO flat ate UPI? in UK and 17 5% VA7 Fo DAM. P&P phase awe ores in 00* 400 twe, Pease Anqwel0/ aq twe m Itsled algae 46 also 6awe n 1007 ranee tubes nag rims*. magnapon otacom ad au0o vme; 46,,205 purchne wakes type FAA PA25 MI5 Mormon Ad C50 UK 0100 Loiol Callers stram APP y NZ, UM IL aim YIYW bble, libisin I Sass TekKG MM. fa 04313S11 Witeferr4,- WANTED WANTED Large or small. Regular supplies of Ex -Rental TN & VCR's. All UK covered, distance no object. Cash on collection, fast efficient service. TEL: TELEVISION APRIL 1993 BUSINESS FOR SALE TV/VCR REPAIR BUSINESS HOME In sunny W. Australia (65,000. o.n.o. plenty of work & scope. 3 bed detached home, separate games room with full size snooker table, brick barbecue. A great outdoor life 20 miles from Perth write to: Don McLeod, 16 Bradbury Road, Armadale, W.A. 6112, or phone: (RUST) or (UK) TWO SHOPS ESTABLISHED 30 YEARS TV & Elect, Sales & Repairs Market Towns, Staffs and Derby. Will separate. Retirement sale. Premises lease or freehold S.A.V. Tel: (Evenings) or TRANSFORMERS,AFIMPAAAFIEFFIAFF1F TV LINE OUTPUT TRANSFORMERS PHONE FAX: ALBA. AMSTRAD. lit 'SII.')I-(( \. DORIC. BUM l't N K'l. FERGUSON. FIDELH Y. (IE.('. irt ;NOR;. GRANADA. HITACHI. HINARI. INDESI F. FIT. KIMARA. N IK KAI. MATST!I. MURPHY. ()SAKI. NORDMENDE.1.01AVE-OPTA. RENEE'.!SION PYE. PHILIPS SANYO. SAISHO. SI TARP. SONY SOLOVOX. 'Mt ' TANDBURG. "IFETITT 'NKEN. THORN TRIUMPH.!WAN\ l' GOLDSTAR. BINA I t /Nlt. FULL RANGE OF KONIG: VIDEO HEADS, BELT KITS, IDLERS, PINCH ROLLERS, TENSION BANDS. LARGE RANGE OF REMOTE CONTROLS IN STOCK TIIINIAN ORDER LTD SANDNVONIIIF RO I). RICHMOND. SURREY. Tw9 2EQ. Apprcrx 1 mile loom Kew Bridge. MISCELLANEOUS Mon -FP 9 am to pm & pm Sat 10 am to 12 noon HOW THEY WORK! HOW TO TEST! HOW TO REPLACE! Designed specifically for Domestic Appliance Engineers who want to enter the fast growing microwave Industry. Packed full of useful information. presented in a simple yet informative style with comprehensive diagrams and illustrations. Fault finding procedures are included at the end of each section. The book contains easy to follow electronic control systems ORDER YOUR COPY TODAY! SWIFTPARK LIMITED 113 LONDON ROAD. HORNDEAN, WATERLOOVILLE, HANTS. PO8 OW TRADE ONLY MICROWAVE OVEN PARTS MAGNETRONS CIODES TRANSFORMERS LAMPS FUSES MICROSWITCHES PHONE NCW FOR PRICE LIST A.W.I. MICROWAVE OVEN COMPONENTS Samuel Whites Estate, Medina Road, Cowes, Isle of Wight P031 7LP Telephone: Fax: CAR RADIO DECODING EQUIPMENT Due :o the increasing popularity of our decoding equipment, we are now in a position to actually REDUCE our prices. As well as this, there have been substantial improvements made to the software, ie. case sensitive help screens have now been installed to guide you through the various stages of the program. On screen PCB layouts are now included as standard, as well as many other enhancements making the system even easier to use than before. The range of radios covered has also been expanded. This latest version of the software is available to any of our existing customers absolutely free! For further information and prices please contact us at: Electronic Sound Systems 62 High NorthgEte, Darlington, Co. Durham Tel: d089 or Fax:

72 .... RECRUITMENT Service Executive When it comes to the design, development and manufacture of consumer electronic products, Sony is in a class of its own. But our customers expect more than excellent products: they demand - and receive - the highest standards of service from our Dealerships across the country. As Service Executive, you will visit independent dealerships in London and the South East to ensure that Sony's service standards objectives are being met - using your initiative to identify training needs, monitor performance and resolve significant customer complaints. You will also give dealers indirect technical support and familiarise them with all new products. This is a multi -faceted role. You'll be a consultant, an admini- London and strator, a problem -solver and a the South East good company ambassador. c. 18,500 + Car Your performance, moreover, will directly influence our success in an increasingly discerning and quality -conscious marketplace. Ideally with 5-10 years in the brown goods industry, you will need a final City & Guilds or equivalent qualification - for example, C&G 222/224 with relevant part 3 subjects. You will also need excellent communication skills, good organisational ability, and the willingness to spend up to four days o week out and about. In return, you can expect a competitive salary with fully expensed company car and benefits including Sony Healthcare insurance, 25 days' holiday, lunch allowance and discounts on Sony products. Do you have the skills and qualities we need? Then discover more about this challenging role by writing with your CV to Maggie Swann at Sony (U.K.) Limited, Sony House, South Street, Staines, Middlesex TW18 4PF. Please quote Ref S ON'Y CAR RADIO CASSETTES Do you turn away work on car radio cassettes because they have security codes. Most radio cassettes can be decoded just by replacing the eeprom (memory IC) with that of a known code, or sending the original for re -coding. All popular makes including Philips, Ford, Pioneer, Clarion, Grundig, Blaupunkt, Fisher, JVC, Alpine, Volvo, etc. Send now for introductory offer, one of each of most popular eeproms + comprehensive eeprom/radio decoding list. Offer includes Philips X2402P: Ford MN010: Blaupunkt Boston CC : Original eeprom re -coding service Radio's sent for decoding from Inc. of VAT and p&p RADIO DECODING EQUIPMENT We will beat any genuine written quotation for supplying a computer or software to decode radio cassettes, ring us first. For technical or general information phone or C.D.H. ELECTRONICS 3 Common Walk, Huntington, Cannock, Staffs WS12 4NB C.D.H. ELECTRONICS ill m, `WslesM TEST EQUIPMENT LINAGE =...V NITER AT2. BMR 95 ENVIR700 AT 2, Audi-Multi-Tester, 16 test -circuits for loudspeakers, tuners, amplifiers, headphones, tape recorders, mikes, boosters.,,. of:n._, ;*:,,.,,,j -.:- Te 'a rei 0.: tl car radios, CD -players; measurment of millivolt, drift, watt. performance; with generator, radio, signal tracer/injector, 13 volt supply etc. - 4 BMR 95 BMR 700 Regenerating Computers & Measurers for CRT's with cathode protection, gas clean-up aid, short repair; exhausted CRT's becomes bright and sharp again even it all, other thachines do not succeed. United Kingdom: P & E Services, Llandudno, Tel. (0492) , Fax Ireland: Donberg Electronics, Ranafast, Co. Donegal. Tel./Fax (075) New Zealand: TDON Ltd., Onehunga, Auckland. Tel , Fax Germany: Ulrich Mater, Oer-Erkenschwick, Fax ( ) 'EMMET. CLASSIFIED LIDEAGE METERS. Reconditioned slot meters for TV rental slot Audiotech. Tel VIDEOCRYPT DECODER. Service sheet with smartcard contact, details Eurocrypt card Interlace, E.M.O., Ramsbottom, Lancs BLO 9AG. Tel PRIVATE RETAILER. has excellent part exchange colour televisions and videos to clear. Tel OCHRE MILL. Technical Services, Grundig N spares for most models to 1985, fast, friendly, helpful, sensible prices. Gt Lype Farm, Charlton Nr, Malmesbury, Wilts SN16 9DR Tel NON WORKING. Ex -Rental & trade in N's & video's for sale, from Telecentre, 164 Mill Road, Cambridge VINTAGE 405 TV ENTHUSIAST. New digital 625/405 standards converters, video & RF outputs P&P. Call evenings. WANTED. Colour tv's & videos, new B grade ex -rental non workers, etc. Regular business cash waiting. Tel advertisements can be submitted on this coupon with a cheque made payable to Reed Business Publishing, Television Classified Room 11th Floor, Quadrant House, The Quadrant, Sutton, Surrey SM2 5AS. The charge is 8.40 per line plus 171/2% (minimum VAT) For Issue Dated Name Ell Debit my Access/ Visa Card (delete) I or next available. Total insertions Total of Cheque Address Post Code Tel Num Signature 1 I I I I I 1 I 1 1 I I...VAT Res No

73 SATELLITE RECEIVERS - New Ferguson BSB Chassis with Tuner, Modulator etc f10 Hand Set f1.50 f4 Post SMALL SATELLITE TUNERS 0/50 to 1750 MHz i. I..5.frequency 400NM 0.00ech VHE/UTIFS.BAND TUNER 3.00 NEW PLASTIC CASE 32 C.H. SAT.RECEIVER (no!wad sell E35 (Wel 15) NEW METAL CASE SAT -RECEIVER. 32 C.H. WITH DOLBY & CHANNEL IC. too hand set) 35 flant fs) DAM MANS CHASSIS AMSTRAD MONITOR C 110 UNIVERSAL TRIPLER. NEW TYPE VIDEO LEADS OTP AMSTRAD Lite O.P. Transistors with Diode 2STE453 d1.00 BURSA 1.01 VIDEO LAMPS. long Lead HITACHI & GEC FRAME, Thick Film 6.00 FIDELITY SPLIT DIODE FCC2215AE..I20 FrC2015BE..110 FCC22I5BE.-110 K30 FRONT PANEL TEITEX TYPE MOO NEW G11 LINE OP PANEL PHILIPS TEARS AHEAD THE CREDIT CARD CALCULATOR Solar Powered 3.75 NEW PHILPS SBC 1833 Solar & Banery Powered Calculator THORN PANEL TX9 REC & REMOTE PANELS with Mains Trans 5.00 TX10 EEC & REMOTE PANELS with Mains Trans 5.00 TX100 FRONT PANEL (10 MBE BASE ON PANEL 1.00 TX9IF 2.00 THORN PANEL No , 51& , 503/102, 515/173, 50II/ THORN TX STEREO SOUND 0.P. PANEL (IC. TA7227P) MO) THORN VIDEO AERIAL AMP 01 M ULTRASONIC TRANSDUCER IN LINE VOLT SUPPRESSOR 1,180 MRD TX100 REMOTE PANEL No.56413IC M293B/and SAA etc NICAM UNIT - Ferguson made for ICC5 Chassis - home market and export - has circuit diagram and can be converted to most sets FERGUSON SUA I SATELLITE DECODER carriage LARGE Foam Pots. Fits Pye, GEC. ITT, Decca BSB SAT/REC HALF COMPLETED. CHASSIS, TUNER AND MOD 5 + Post 3 MARCONI CONPACT L. N B. 1.2DB TO 11.7GHZ 60cm SATELLITE DISH 35 Postage es 15p 21p Replan, 90% of Philips Handsets Philips Video RT/V Handsets with 1.13C display LB.CO AV5661 AV CAMCORDER SANYO NP22 6v 1300mah Rechargeable Battery Pack 6.00 SATELLITE UNIT Video Out/Audio Out, L and R Polariser ± 35M/A and Decoder Socket 10 Philips Stereo Headphones No. SBC MHz Changed Over Relay Aerial THICK FILM HITACHI HM9205A 4.00 TX 85 FERGUSON BATTERY MAINS CONVERTOR 5 each TX9-TX100 FRONT PANEL 5 WITH REMOTE 10 NON REMOTE 8 push button 10 PHILIPS NEW TYPE UN HANDSET 10 GLASS BEADS Diodes 205 '1 2A 50 for GI I LOFT Panel GI I Tip Switch G II IF Panel GII Decoder Panel GS Push Button Unit GB Con/Panel New Back Typo 4.90 E Have you Rd Acid Rain In your garden? PH SIFTER Video Power Supply for Amstrad. Last year mods. Maim Transformer for An Video MIXED TOSHIBA HAND SETS FIVE FOR p III post) LATEST VIDEO For latest Philips. GEC. Pye and Hitachi. Front panel veth memory dap and bush Ninon andpots and LED's FERGUSON CHASSIS [ICC: 2712 IM.C-2000 IC1C-2705 F.A.11.-/SLICL1/41v1./P.TT'SC -E3C89 icx98 GEC. HITACHI DECODER PANEL LEMMAS, TRAIL*, HAV215A. UPC SCART TO SCART LEADS TX90 REMOTE PANEL IC TMS1000 AND M Mixed AMSTRAD VIDEO MOTORS 5.00 SATELLITE TUNER UNIT with Base Band, Video Out X108 way Niacin unit 24v SAmp MAINS TRANSFORMER 10 MD:ED FERGUSON CIRCUIT DIAGRAMS MSHIFC WWI EACH MCA D TH K4 LO PT. K35 L.O.P.T K SATELLITE TUNER 950MHs-1750MHz 5.00 SPLIT -DIODE EIS TX RD Green Spot TX100 Yellow Spot LO PT TX90 White Spa L.O.P T Spin Diode 110? Orion 65-3M GEC TX9 Than LS EACH W TTT PANEL CMC 301 CMC 113 CMC 302 CMC 115 CMC CMC 96/4 VIDEO LEADS 4 for El SEL ITT IFB254F2 Front Panel DECCA - GEC - ITT 6 push button 5.00 TELEVISION APRIL 1993 BURGLAR ALARM 2.00 with siren 9 VOLT RELAYS 35p 5V -12V -24V -48V Large and Small 25 Way Plug and Socket with Case 1.50 MAO V.?? DST 8IN243 TF134023AD 1600 MSHIFF MSHIFEIW DSTI86N TOSHIBA DST 156N TEM-4023AD RIO CP90 Philips Split Diode p EACH 10 off MOO MDA2062 DAMAGED AMSTRAD 1610 Colour Monitor Chassis 6 * post NEW 20 TX100 FRONT PANEL Button SALORA SAT RECEIVER CONVERSION KIT For models 24M60, 25M90, 28M90, SB1206E, SB TX90 TO TX100 8 BUTTON UNIT 4.00 KIKUSY / cric Gnu ALB ,79 TX El 0 VIDEO AMSTRAD El HANDSETS (EXPORT) 4'4Evn WILL WORK IN HOME MARKET P8500 Panic and Button Transmitter 180MHz GII CAP 250V, 470M NOT WORKING NEW PROFESSIONAL SATELLITE NO HAND SET METAL CASE writ' METER. DOLBY CHANNEL. C WITH POLARIZER SUPPLY 20 5 post SEND FOR DATA AND PHOTO SATELLITE FINDER KIT AND LNB TESTER WITH METER BOX 25 BSB or D2 -MAC 35cm DISH and LNB 11.7 to Gas Soldering Irons New Type Variety Nickel Cadmium Batteries from Telephone Type to Sub-C. per cell. Mainly is packs of 6 to 8. HITACHI UHF -VHF SMALL TUNER ET590A ET595A PHILIPS UNIVERSAL BATTERY MIER SRC 1695 BATTERY CONVERTER FOR TAILS FERGUSON DM Mains input choke for TX9 E MIR ONE 1.C. 35 Decoder PHILIPS Deck Calculator REGULATED MIL SUP. 5006A/A 1.5V -12V DC synched & ITT Tuner & IF. Can HE-in:dale 2 UK K13 -K STRS40I f5.00 TX100 Push Button Ulla 16 CH WIRE PIPE stud detector MICROWAVE leak detector 4.90 WIRE& PIPE detector CAR ADAPTOR fused 3 Amp Long Lead with plug for TV etc 25p 500 off, 15p Each DECODER C -CAM PHILIPS MADE for K40 CHASSIS IC No. TDA RGB. CONVERTER TV - Video - Hi-Fi Video in: R.G.B. out in black metal case with black knobs 56420A 20A/600V THYRISTOR 1.75 LCD VIDEO AMSTRAD HANDSET for models each ITT BG A TRIPLER 5.00 ITUNOKIA RF W MODULE 20 COAX PLUG TO PHONO LEADS 1 SCART TO SCART LEAD11 TV GAMES AERIAL VIDEO COMBINER SWITCH 1.50 MIXED 20 BRIDGE FIEUi WIERS (I Amp to 5 Amp) 1.50 TRANSFORMERS 24357/ FERGUSON AMSTRAD TVR3 LPTS 10 ITB3069D EQU TF134009AN 20 MHz OSCILLOSCOPE MOO FERGUSON CHASSIS 40 MHz OSCILLOSCOPE 5042) 2250 DELAY IKC 2171 M OO BO MHz OSCLLOSCOPE ) ADDDYLAMMADLE IKC 7701 m AMP POWER SUPPLY WRH MAWS PLUG 4 A12034C0 A12041E11 AT2/355 At/07615 A12076/38 A1207&51 CNC 820 C's PHILIPS HALOGEN UG/fT. NEW. NO HOFF SWITCH. NO HANDLE WITH CORD. BLACK IN COLOUR 5 AT AT207&71T AT2000/15 RCO ST CT FBI65KA Orion BRIDGE RECTIFIERS 10 FOR Amp for Video Power Supply MPS HAND SET G11 TEXT IN RED Gil HAND SET PHILIPS RC5 G11TRTULTRA.SONIC El 0 HAND SET f15.00 ULTRASONIC 10 EASY CONTROL 10 TRV3 Amstrad Cassette Mechanisms. New with 2 motors and sound heed. 15 TVR3 Power Supply. 5. Amstrad Television Tuner UHF. Small, Fits most Amstrads. 6. SENDZ PHILIPS SSC 522 RGB) GENERATOR 90 PHILIPS SBS 850 ANALOG MULT1METER PHILIPS SBS 521 RF SIG GENERATOR SEE BACK PAGE FERGUSON TX110 -IK2 and IK7 MANUAL 1 each FERGUSON ICC5 STEREO O.P. PANEL IC. 1DA11405 TDA8421 TBA SEND FOR DATA D2 MAC SATELLITE RECEIVER, LNB AND DISH. 50 (f10 Post) THORN M494BI on Resole Panel 15 PHILIPS STEREO HEADPHONE 4.00 PHILIPS C.D. MECH THORN FRAME IC TX100 etc IC TDA 3652 IS OBSOLETE REPLACEMENT TDA SALORA He RACK MOUNT SAT RECEIVER with Variable Tuning NM 5.f11 STEREO SOLAR RADIO VHF AND MW COST 25 PHILIPS METER ANALOG 19 CASSETTE MAINS LEADS 30p G AffD 250v /1.35 SCART Socket. Print Type 20p TELEPHONE EXT. LEAD 3 Metre 30p LEAD SCART TO D PLUG SOP BRIDGES RECTIFIER Mooed BR -31 to 34 2 Amp to 5 Amp it for NEW LUXOR SATELLITE ANTENNA POWER DRIVER T6070V TX9 Transistor 1.90 I METRE SCART LEAD 1.00 VIDEO SCART TO SCART ALL PIN, LONG LEAD 3.00 ALL PINS T700 TX925 TX100 Maim Switch with Stand-by and Lead IDA 3562A 10 off each each UHF Modulator MPM p SHARP MSHIFCF09 10 FIT MOST EACH SETS New Thorn Hand Set I I -0i Type u/v ( 10) VIDEO MOTOR for V1368 type VC62DD AMP TUNER IF fia VT566 Hitachi & GEC 0.03 UN TRIPLERS TO MO AMSTRAD VIDEO HAND SET WITH LCD 110 NICAM MMI KIT MODULE /20.00 with date Burglar Alarm 11 as time delay to Oct 2 Mains 1 randormer v in 110V to 120v out I amp post 3 459

74 SENDZ COMPONENTS TO ORDER SEE BACK PAGE LAI TAA7750 HA UPCI373 M58657P M M M58658P Receiver 1X100 Panel I.C. No. SAB3035 -IVIAI38440P SAA1060 -PCF8571P WOAD High Voltage Condenser 12 INS to 8NZ 1500V to 2KV TX9 C.CAM Decoder Types Fidelity front panels with i.c as& BB 103 BB 105A x 12 BB 105B BB 105G x BB12Ia lop 1A/1600V DG3P ECIV-BY228 2 amp bnage rec. wire end SICE4G7J02 Eqv. BYX71/ ns. 3 Way/7=M adaptor 240V 6V/ 7.59V Rank/Toshiba preh inn Push button unit preh 6 Push button VHF/UHF for v/cap. GEC -Deem ire 7 Push button for CVC5 ITT 1(73 12 Push button unit KT3 (Export) 12 P.B.0 6 Push button Unit Thom 6 Push button GRC 6 Push button PYE 731 Hearing aid unit Rank Z7184 P/EVUnit MECH 7 Button Unit GEC with Lamps 697 Push Burton Unit -f-mntel 10p p 15p LLOD / f TT14 GEC TEX-DECODER 13 IC Panel ends cable form PHILIPS Decoder SAA IC B-5050 K40 Text Panel moo ICCS TUBE BASE ON PALEL ICCS DECODER PANEL (35 Decoder (35 Sound OP Thick Film Daughter Kt CH. 1(30 Tex Rec Front Panel with I.C Phig K4 Focus Pot K Fidelity Tube Base with transistor & focus ,01 TX10 Tube Base on Panel PHILIPS HAND SET K , etc 10 Universal Triplet with small focus pot. Green type THORN CASSETTE HOUSING PAS26/35U LITHIUM BATTERY BR -2/3 Volts L p TUNER. SAT MOO KHC 18 MIXED FUSES I1/4 AND 20mm and Black Print Type 100 off f2 Whip Regulators +5V/UA78P05SC -8V/79M0lic +6V/78M06c LM 3171 LM 337 ]lot 342/18 LM V/LM 340T12 +18V/MC78M18 +24W78M24 MC 7724cp MC 7824 Power Supply for Sinclair Spectrum +2 L5.00 Bush Thyristor RCA Transformer v-500Mo Chassis type Transfomier 240v/12 Volts 500m/a CVC 20 tube base Tube Base Rank & 011 KBL 005 KBL 02 KBP 04 WO2 W004 BRIDGES WOOS 800V Bridges 21/2 Amp p 75p ELM) p 30p 15p 15p 20p 3Dp K30 Drawer Ass with pots cable forme TX10 Drawer Ass 300 Modulator for Ferguson Sat Receiver 5.5Meg or 6Meg 1.75 Radio Telescopic Aerial Coax Plugs EACH lip De -solder pump + 2 nozzles Philips Flat Red LED and Green K30 Therrnistor SP 75p De -solder Pump 330 Gas Soldering Iron Hill Meter Leads, S/Rubber and Probes Tatung GEC 8 Button Unit Print Type 1990 to 1992 MCI Philips Handset IC SAA3010P MAB8461/W063 MAB 8420P.0031 MAB 8400B-6 MAB 8440P -D070 MAB 8440P -D033 MAB 8440P -D056 MAB 8441P.1001 MAB 8441P -T LIN M58484P FERGUSON IC' Ferg-TX982 TMP47C 634N 2685 ST /B2 ICC7 CMC 301 front panel CMC 303 front panel Intonational Rectifier EHT Diodes G770/HV346KV 6A/600V Stud Diodes Rep BTW R 6A/1000V Stud Diodes 20p 24A473 PNP C/P for saw lop CMC 302 Panel with TC mains switch etc 0.00 Turntable Swine Modulator Sound 5.5Mllz MPM Sound 6.0MHz MPM 1040 Safe Block L5.03 FEROX RF FilterClamp for CoAx Cable 2.50 Ferguson TX8.5 TVA Switch Mod Transformer TX% Con 12.5p each) ELOO ICCS Ferguson Switch Mod Trans ICCS LO.P.T. DST 11/0243 DST Thom Mixed Ferguson Hand Set 1CC5 Mod IIC emelt &00 18,00 KT3/K30 West KT3/K30 Fun remote Pye & Philips handset KT3-K30 chassis. No RC C5176-RC5071-RC5177, Special Price RC4001 KT3 and Teletex T3C10 Hand Set Text TX9 with Text TX9 & TXIO button print T7C10 Focus Pots Mains Stand By Switch with Cod PHEIJPS UNIVERSAL HAND SET RC5 ILT3 - K We haver parts for Philips Handsets RCS353 RC5300 Philips RC ( TEXT -TYPE Replace Hand Set (or Philips K4 etc THORN HAND SETS WOO - WOO - TX9 - TXIO -TX100 Text and Non -Text /10./0 PHILIPS RC5171 (HAND SET) L K4 HAND SET Repaired for 5.00 SANYO MAGMTRON Type 2M218H 110 Microwave Oven Condenser 1.5 MFD 2K W Panels Ferguson Mixed from TX.9 to ICCS 12n TV Aerial Ring Type 401, TX100 Remote Hand Sets 10 Philips Video Remote Hand Set Works nowt sets. No L.C.D. Display 16 ITT -Nokia Tuner IF RF-IF-Module SEE -Err HF-Module 2 UK M RUI 13 Woy Preen. for TX10-TX V Text Panel ICCS Ferguson Sharp Tuner and IF PALI UK 1 I n Ttmer IF UE30-B0 3 Amstrad 63 LI GRUNDIG TRWLER BG TOSHIBA REMOTE CT TV GAMES COMBINER SWITCH 1 AMSTRAD SANKYO CAPSTAN MOTOR 6,000 3 AMSTRAD LOADING MOTOR 6,000 1 HAND SETS FOR 6000 SERIES AMSTRAD FOREIGN ORIGON 4 WITH LED TOSHIBA REMOTE CT TOSHIBA TN TUNER. IF ENV G2F 3 PHILIPS K35 ETC 12 WAY SWITCH WITH KNOBS SOLDER 500G 3.75 AMSTRAD FOREIGN ORIGON HAND SET 3 AMSTRAD VIDEO FRONTS WITH FLAP LONG CHASSIS ALL MODELS MADE IN 1991 TO 1992 AND DECCA PRO LINE 4 AMSTRAD - LONG CHASSIS AND SHORT CHASSIS POWER SUPPLY 4 MODELS 1991 TO 1992 DOUBLE DECKER SWITCH MODE 8 POWER SUPPLY DOUBLE DECKER CHASSIS. ALL PANELS 5 each panel AMSTRAD LONG CHASSIS DISPLAY PANEL 1992 TO AMSTRAD TUNER UE33-B01 3 IF 2 PHILIPS INFRA RED RECEIVER IN -CAN TELEVISION APRIL 1993

75 DIODES Voltage Regulators ML 'FBA 1440C 1.00 TDA Bridge K p BY 126,0 4.5VU A78P05SC MAB8400B-C 30p 2.00 TBA480(,) 1.00 TDA2575A 1.00 MAB8440 P -D TBA A2577A 2.00 BY 127, 0'h -8V/79M08c BY 133 id, 46V/78MOlic MAB8441 PT TBA TDA2578A 'PP SENDZ COMPONENTS MAB8420PC TBA TDA2579A 2.00 BY , LM 317T 30p BY p LM p 63 Bishopsteigntoo, MAB8422P-0005 L2.00 TBA560C TDA258 I 2.00 BY p LM 342/18 30p Shoeburyness, ESSEX SS3 8AF. MAB8440P 2.00 TBA BY p LM MAR8400XX BA625 TDA BY p + I2V/LM M708LB TBA65 I 2.00 TDA2560 SOp BY p (-18V/MC78M p BY (96 30p 424V/78M24 SEE BACK COVER MM MM56181 TBA73 1. TDA p 1.00 TBA7650C) IDA26( BY 1 MC 7724cp MM TBA TDA26I IA 1.00 BY 21)4/4 MC TO ORDER PCD8571P 3.00 ' SOp TDA2611A0 LIM BY BY 4(17 Etiv op K35 Philips Receiver IC TBA810AP 60p TDA365I A 1.00 BY 208/800 8p MA1250 BJC 3.00 TBA810S 60p TDA B Y 210/400 5p M491BBI 3.00 TBA820 60p TDA BY 210/800 10p Ferguson ICs M RS A820M 25p TDA BY p Per 7X982 BY 224/6(0): 4.KA1600v CV MM5290N-4 75p 1.50 TDA p TMP47C 634N y 716 ""G'4,,h lop MM53108N 4.00 TBA920Q TDA bridge 50P ST6391 B11132 ICC y ,p--'' MN TBA TDA BY p 4),,I) BEM MNI25OBJC 2.00 TMS1000NL 2.00 TDA BY 227 ISp Y p "P BDT3I A 50, MRI366 20p TMS IS43 N2L TDA3300B 5.00 BY v 20p Y 827:6A/ I KV 2013 BDX75 20p (clockchip) 1.00 TDA Flat BY229 black 15p ICCS Main ICs Y P BDV64B NE555P 60p TMS TDA BY 229 Red 20p ICC Remote 1.C. Y 933 5p BDU65 Sop NE555 60p TMS TDA BY 229/4)51 30p CCUFRGO Y 969 BF NE556 TMS27081G45 45p BY 229/800 30p CCUERGO :10 Y BF769 30P NE646 TMS2716.1L 1.00 "I -X982 TDA BY 237 Op IC FERG -,4r BY 254 Min 12 volt Relays BF ) 10p 1K7 ST6391 B1 /3.00 -P BF819A SOP BY p R (2 IC TMP47C634N GOP BF858 4IL-1 TMS ' p TMS3720ANS 3.00 TDA BY p R 1039 GOP BF OPT6(X) 20p TMS p TDA BY P MR p R2009 SOp BF871 30p OPT601 20p TX TDA BY 406 8P MR 501 R BFR52 7p 1, p TMS TDA3571A BY P MR , R 2029 sop BFR81 ISp PCD857IP ULN2004P 1.50 TDA BY 4117a 10P BCW ,,,,, BFS60 10p PCD8572P 2.00 ULN p TDA ', BY p 13FT42 BYF , R 2257 mop 8F P SAA6I UPC TDA BY 5(X)/200-5 amp 2,013 BYF 1204 R 2265 SAA66I 1.75 UPC585C.0 TDA3592A E3.00 BY 527 lop 50P BFW I 1 lop"p BY 602 BYF p R 2305 V UPC1009C 10p BFXSS 100V, 1 amp BYV 26C 10p BYF p R p BSD2 I 5 SAA UPC1031H 2.00 TDA365I 3.00 SOP F247 inh BYX 10 lop R 2322/2323 pair 0fin MR1366-0,,' SAAI UPC1353C GP2OG - -` BYX 38/ p R A N ,0b SAA UPC1363C 2.75 TDA3652 E P BRC-M p SAA UPC 1364C 2.00 TDA3653AQ 2.00 GRP80G c7x10) 30p BYX 55/350 10P R P BRC-M-31.XI SAA UPX1365C 2.00 TDA XK , BYX 55/600 (Bead 1 110P R P BRC 1693 LIAO SAA UPCI 366C 1.00 TDA BYV 28/2(X) 20p BYT 71/600 15P R2430 SOp BT 1.00,,, SAM UPCI 378H 2.00 TDA Bridge TXIO 800/3 amps 30p BYV 95B 1 P R 2433 = BDI24 30p BTT822 G'("G KBPC35-02 Bridge SAAII BYV 5C 2.00 UPC 3.00 TDA up R BIT Bridge Rec. 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STK TD6306P 3.00 AC106 25p BF194 10p 'TIC 225S Sop,h -"',1).FCE520 BD p mc476p 1.00 STK TDEA440Q AC121 25p p TIC 226E SOP 2N930 ";G MC STR5804 I 5.00 TDA1003A 1.00 AC124 25p BFI96 10p TIC 226m '3' BD138 30p MCI312 1A TDA1011) 1.00 ACI28 25p BFI97 12p lip TIC 236m 31)1) 2N Sop MC1330 GN 'FA A320A TDA ACI BF198 10p (ip TAG 226/600 Sop 2N p B D176 25p MC ACI5I 25p BF199 10p TICV 106D , ,., hh MCI TAA570 75p TDA1013A 1.00 ACI31 25p BF2(X) 20p (T092 case 2A/401V) - MC p a ry 3(1,0 B0I83 TAA611B 1.00 TDAIO8)A AC138 25p BF222 10p 1 70P MC14002 TIP 29 15P 25,,, 2(6371(2 lop BD202 30P MCI4013 7AA62I UM TDA1035SB 1.00 AC152 25p p TIP 30 '-'11 3N p BD204 30p MCI4016 ilp ACI53K 25p p TIP 30A 2N p MC g TDA1150 SOp ACI42K 25p BF ,",0 TIP 30B -'1) 2N p ,, MC14514 '50-'h 1A7120P SOp AC169 25p p TIP 30C a.,,"p p ,,,,-r MC '0 'TA7315AP TD A1154 AC I 76 25p BF p TIPS1 Gil) ",' MEM4956 MOO TA7137P TDA1170S 1.00 ACI78K 25p BF255 20p B0228 TIP 32 SOP M1_ `-",P TA7I93AP 3.00 TDA1180 UAW ACI79 2.5p BF256 20p B0226 TIP P ETT TA7240AP.,'"hP 2N TDA AC186 25p BF257 20p TIP 33C 200 B p ML ,'"P 2N5296 TA TDA p AC188 25p 13F258 25p GOP TIP 34A BD234 25p ML236E "11P 2N5983,9.L TA7609P TDA TIP 34B 30P B13235,,,,, ML237B ACY21 25p BF262 15p '"",6 P r,,,,, ML238B TA7227P 1.00 TDA1327A 69p TIP 34C 4 11,n_ B ADI43 BF263p 25p 'GP 2N6109 ""'" ML239 f2:00 1A7265AP TDAI ADI49 BF264 15p TIP 35B ",,.."1) BD239 50P 3N6130 'HP 35C '"G h7h_gp 'N p TIP 350 "Yr 2N6348, 15p.1A7608AP 3.75 TDA AF17A 25p p BD240 TA7680AP 3.00 TDA1540P 3.00 AF139 25p BF273 10p BD243c THYRISTORS TA7750P 30p TD A 1670A 2.00 AF E274 10p 3G1) Philips Kits OT121.h TIP 36 5GP 2N6399 /0-' P IR1016A ""G TBA120A 40p TDAI908A LW AF BF324 25p TIT, 36C 7,rGP 20A417 20p B0250a 30p BT151/500-20; TBA120AS 40p TDA AF367 25p TIP 41 ''P 2SA p BT106 Plastic 30, TBA120SA 40p TDA p AL p 10p TIP 4IB 4..0p 2SA844P 10, BD253B 50, BY106 Metal TBA120B 40p TDA BLY p TIP 4I0 21) mop p BT A120SB TDA BFI 15 20p p T A992 10, BD p 1.00 TBA120T Sopp TDA p p 'LIP 42/BRC 6109 lop BRC4443,."13 2SB474 30p B P 25p TBA120SQ 1.00 TDA E127 20p BF391 15p G11 Tyristor TIP 48 60P TBA 120U.",,,P p p TDA p p 25p Decca TIP 49,6 0S '113A1200 '",hp p p fl. 30p TDA p p TIP 57 i'",,,,p 2SC515A , MCR72-6 TBA120C 40p TDA p BF422 15p TIP 1011 ""P 2SC772 20p BD139 SOP OT112 /cob TBA TDA BFI61 20p TIP 102 3G1) 2SC381 10p TF320M B TBA TDA2320 BF164 60p BF448 30p TIP 110 s 17,2,_ P 2SC BA23I 75p TDA2545A 1.00 BF179 30p BF470.30p 50P BD544D TIP 115 GOP 'i'p TBA3950 2SC491 TDA p BF471 30p TIP P 306MHr B SOp,, TBA TDA BF597T 10p 1OP TIP 125 B p 17089R 2.00 TBA396 ',,LP 35C733 75p TDA p 1OP TIP p 17053R GM' ) 1.00, TIP 127 GOP BD682,,,,, TBA440P 1.00 TDA P2M 2SC1030 4"-). 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76 DISH AND LNB SUITABLE FOR D2 MAC 15 POST 5 + VAT New Eprom for converting Ferguson BSB Receivers to D2 MAC and PAL - 99 channel is tunable and ea one can be put into memory - also has menu. 20 PAL panel (to convert to PAL) 20 SEND FOR DATA. CHASSIS SUITABLE FOR CONVERSION TO D2 MAC 10 HANDSET 1.50 POST 4 + VAT SENDZ COMPONENTS 63 Bishopsteignton, Shoeburyness, ESSEX SS3 BAF. SAME DAY SERVICE All items subject to availability. Technical Information by telephone only. No accounts: No Credit Cards Postal Order/Cheque with order Please add 1.70 posvpacking (unless otherwise specified) and then 171/2% VAT to total. Export orders charged at cost. For all EEC & overseas countries please add VAT, at rate if no vat number. Callers: To shop at 212 London Rd., Southend. Tel ' Fax Open SL ,6. GVMT - school orders accepted on official headings.